en_tn_condensed/eph/03/10.md

This plan was made known through the church

This can be stated in active form. Alternate translation: "God made this plan known by means of the church" (See: rc://en/ta/man/jit/figs-activepassive)

rulers and authorities

These words share similar meanings. Paul uses them together to emphasize that every spiritual being will know God's wisdom. See how you translated similar words in Ephesians 1:21. (See: rc://en/ta/man/jit/figs-doublet)

in the heavenly places

"in the supernatural world." The word "heavenly" refers to the place where God is. See how this is translated in Ephesians 1:3.

the many-sided nature of the wisdom of God

God's great and complex wisdom is spoken of as if it were an object with many sides. Alternate translation: "the great and complex wisdom of God" (See: rc://en/ta/man/jit/figs-metaphor)