Complex sentence: It hosted various athletic competitions and became the home stadium of the San Francisco 49ers of the AAFC and NFL from 1946 to 1970, also hosting the Oakland Raiders of the AFL for one season in 1960.
Split into simpler sentences: It hosted various athletic competitions and was the home stadium of the San Francisco 49ers of the AAFC and NFL from 1946 to 1970. It also hosted the Oakland Raiders of the AFL for one season in 1960.