Complex sentence: Creeley was hired to teach and to edit the "Black Mountain Review" in 1955, and when he left two years later for San Francisco, he became the link between the Black Mountain poets and the poets of the San Francisco Renaissance.
Split into simpler sentences: Creeley was hired to teach and to edit the "Black Mountain Review" in 1955. After he left two years later for San Francisco, he became the link between the Black Mountain poets and the poets of the San Francisco Renaissance.