Who also (hoi kai). Common use of kai pleonastic to show that the two events were parallel. This is the simplest way from Homer on to narrate two parallel events.
Why? (tōi). Jesus had told them of his coming Ascension (Joh 6:62; Joh 20:17) so that they should have been prepared.
This Jesus (houtos ho Iēsous). Qui vobis fuit eritque semper Jesus, id esto4, Salvator (Corn. a Lapide). The personal name assures them that Jesus will always be in heaven a personal friend and divine Saviour (Knowling).
So in like manner (houtōs hon tropon). Same idea twice. “So in which manner” (incorporation of antecedent and accusative of general reference). The fact of his second coming and the manner of it also described by this emphatic repetition.