Complex sentence: He was the son of two teachers, Carrie Lena Fambro Still (1872--1927) and William Grant Still (1871--1895), who was also a partner in a grocery store and performed as a local bandleader.
Split into simpler sentences: He was the son of two teachers, Carrie Lena Fambro Still (1872--1927) and William Grant Still (1871--1895). His father was a partner in a grocery store and performed as a local bandleader.