https://www.amazon.co.uk/Discourse-Ana ... 428&sr=8-1
On page 29-30 he indicates that du Toit in Neot 8 (1974):64 sees 1:3-12 as 5 sentences.
“… A. B. du Toit gives a semantic argument for seeing the use of the relative pronoun as signalling another sentence(or colon as he terms it). He argues that the relative pronoun, especially the preposition plus a relative, carries sufficient semantic weight to be considered a separate unit, and thus, the relative sentences in this section should be considered as separate sentences. He further argues that the relatives could be replaced by the third person personal pronoun without changing their meaning. For example (ἐν ᾧ) could be substituted for in this (ἐν αὐτῷ) in v.6: in this (namely the provision of salvation described in vv. 3-5) you rejoice although for a little while being grieved by various trials is necessary. His semantic argument explains why the Greek text is punctuated as it is…”
1 Peter 1:3–12 (UBS5): Εὐλογητὸς ὁ θεὸς καὶ πατὴρ τοῦ κυρίου ἡμῶν Ἰησοῦ Χριστοῦ ὁ κατὰ τὸ πολὺ αὐτοῦ ἔλεος ἀναγεννήσας ἡμᾶς εἰς ἐλπίδα ζῶσαν διʼ ἀναστάσεως Ἰησοῦ Χριστοῦ ἐκ νεκρῶν 4 εἰς κληρονομίαν ἄφθαρτον καὶ ἀμίαντον καὶ ἀμάραντον τετηρημένην ἐν οὐρανοῖς εἰς ὑμᾶς 5 τοὺς ἐν δυνάμει θεοῦ φρουρουμένους διὰ πίστεως εἰς σωτηρίαν ἑτοίμην ἀποκαλυφθῆναι ἐν καιρῷ ἐσχάτῳ 6 ἐν ᾧ ἀγαλλιᾶσθε ὀλίγον ἄρτι, εἰ δέον ἐστὶν, λυπηθέντας ἐν ποικίλοις πειρασμοῖς, 7 ἵνα τὸ δοκίμιον ὑμῶν τῆς πίστεως πολυτιμότερον χρυσίου τοῦ ἀπολλυμένου, διὰ πυρὸς δὲ δοκιμαζομένου εὑρεθῇ εἰς ἔπαινον καὶ δόξαν καὶ τιμὴν ἐν ἀποκαλύψει Ἰησοῦ Χριστοῦ 8 ὃν οὐκ ἰδόντες1 ἀγαπᾶτε, εἰς ὃν ἄρτι μὴ ὁρῶντες, πιστεύοντες δὲ ἀγαλλιᾶσθε χαρᾷ ἀνεκλαλήτῳ καὶ δεδοξασμένῃ 9 κομιζόμενοι τὸ τέλος τῆς πίστεως ὑμῶν2 σωτηρίαν ψυχῶν.
10 Περὶ ἧς σωτηρίας ἐξεζήτησαν καὶ ἐξηραύνησαν προφῆται οἱ περὶ τῆς εἰς ὑμᾶς χάριτος προφητεύσαντες 11 ἐραυνῶντες εἰς τίνα ἢ ποῖον καιρὸν ἐδήλου τὸ ἐν αὐτοῖς πνεῦμα Χριστοῦ προμαρτυρόμενον τὰ εἰς Χριστὸν παθήματα καὶ τὰς μετὰ ταῦτα δόξας. 12 οἷς ἀπεκαλύφθη ὅτι οὐχ ἑαυτοῖς, ὑμῖν δὲ διηκόνουν αὐτά ἃ νῦν ἀνηγγέλη ὑμῖν διὰ τῶν εὐαγγελισαμένων ὑμᾶς ἐν πνεύματι ἁγίῳ ἀποσταλέντι ἀπʼ οὐρανοῦ, εἰς ἃ ἐπιθυμοῦσιν ἄγγελοι παρακύψαι.
I noticed that THGNT also seems to punctuate before the relative pronouns
What are your thoughts on this view of the relative functioning as a type of colon?3 Εὐλογητὸς ὁ θεὸς καὶ πατὴρ τοῦ κυρίου ἡμῶν Ἰησοῦ χριστοῦ, ὁ κατὰ τὸ πολὺ αὐτοῦ ἔλεος ἀναγεννήσας ἡμᾶς εἰς ἐλπίδα ζῶσαν δι᾽ ἀναστάσεως Ἰησοῦ χριστοῦ ἐκ νεκρῶν, 4 εἰς κληρονομίαν ἄφθαρτον καὶ ἀμίαντον καὶ ἀμάραντον τετηρημένην ἐν οὐρανοῖς εἰς ὑμᾶς, 5 τοὺς ἐν δυνάμει θεοῦ φρουρουμένους διὰ πίστεως εἰς σωτηρίαν ἑτοίμην ἀποκαλυφθῆναι ἐν καιρῷ ἐσχάτῳ· 6 ἐν ᾧ ἀγαλλιᾶσθε ὀλίγον ἄρτι, εἰ δέον *ἐστίν, λυπηθέντες ἐν ποικίλοις πειρασμοῖς 7 ἵνα τὸ δοκίμιον ὑμῶν τῆς πίστεως πολυτιμότερον χρυσίου τοῦ ἀπολλυμένου διὰ πυρὸς δὲ δοκιμαζομένου εὑρεθῇ εἰς ἔπαινον καὶ δόξαν καὶ τιμὴν ἐν ἀποκαλύψει Ἰησοῦ χριστοῦ· 8 ὃν οὐκ *ἰδόντες ἀγαπᾶτε, εἰς ὃν ἄρτι μὴ ὁρῶντες πιστεύοντες δὲ ἀγαλλιᾶσθε χαρᾷ ἀνεκλαλήτῳ καὶ δεδοξασμένῃ, 9 κομιζόμενοι τὸ τέλος τῆς πίστεως ὑμῶν, σωτηρίαν ψυχῶν· 10 περὶ ἧς σωτηρίας ἐξεζήτησαν καὶ ἐξηραύνησαν προφῆται οἱ περὶ τῆς εἰς ὑμᾶς χάριτος προφητεύσαντες, 11 ἐραυνῶντες εἰς τίνα ἢ ποῖον καιρὸν ἐδήλου τὸ ἐν αὐτοῖς πνεῦμα χριστοῦ προμαρτυρόμενον τὰ εἰς χριστὸν παθήματα καὶ τὰς μετὰ ταῦτα δόξας· 12 οἷς ἀπεκαλύφθη ὅτι οὐχ ἑαυτοῖς ὑμῖν δὲ διηκόνουν αὐτά, ἃ νῦν ἀνηγγέλη ὑμῖν διὰ τῶν εὐαγγελισαμένων ὑμᾶς πνεύματι ἁγίῳ ἀποσταλέντι ἀπ᾽ οὐρανοῦ, εἰς ἃ ἐπιθυμοῦσιν ἄγγελοι παρακύψαι.