I assume that the disciples returned and then told Jesus what they had done. If I understand this correctly, you could translate this "and when the apostles returned, they told him what they had done". They must have first returned, then told him.Luke 9:10 wrote:Καὶ ὑποστρέψαντες οἱ ἀπόστολοι διηγήσαντο αὐτῷ ὅσα ἐποίησαν.
καὶ παραλαβὼν αὐτοὺς ὑπεχώρησεν κατ’ ἰδίαν εἰς πόλιν καλουμένην Βηθσαϊδά.
I assume that Jesus "took them and withdrew", and that these things happened more or less at the same time. You could not translate this "when Jesus took them, he withdrew", that makes no sense. It should be translated "Jesus took them and withdrew", which feels like simultaneous action to me. He couldn't have taken them first, without taking them in a particular direction, this is happening at the same time as withdrawing.
Did I get this right? Do I need a more sophisticated set of rules for the time of the main verb and the time of the aorist? Or should I say that it is generally prior but sometimes it is more or less simultaneous?