Having gone (πορευθεις). First aorist (deponent) participle (not periphrastic) of πορευομα.

Being made subject (υποταγεντων). Second aorist passive participle of υποτασσω (see 1. Peter 2:18; 1. Peter 3:1) in the genitive absolute construction.

Unto him (αυτω). Christ. See 1. Corinthians 15:28.