Complex sentence: Johnson serves on the board of Curriki, a non-profit organization formed to empower educators to deliver and share curricula, as well as the advisory board of a Salvation Army rehabilitation center based in South San Francisco.
Split into simpler sentences: Johnson serves on the board of Curriki, a non-profit organization formed to empower educators to deliver and share curricula. He also serves on the advisory board of a Salvation Army rehabilitation center based in South San Francisco.