Here the word "he" refers to Jesus. Except where otherwise noted, the word "you" in the book of Acts is plural. (See: [[rc://en/ta/man/translate/figs-you]])
This is a reference to the Holy Spirit. Alternate translation: "the Holy Spirit, whom the Father promised to send, about whom Jesus said" (See: [[rc://en/ta/man/translate/figs-metonymy]])