Complex sentence: By the early 1950s, he was playing music again, and was among the first to record for Sam Phillips at Sun Records in Memphis, who would later record Elvis Presley, Carl Perkins, and Johnny Cash.
Split into simpler sentences: By the early 1950s, he was playing music again. He was among the first to record for Sam Phillips at Sun Records in Memphis, who would later record Elvis Presley, Carl Perkins, and Johnny Cash.