Original sentence: In the early 1970s, the 96.3 signal was home to a very successful Top 40 CHR station, known as 96 WMYQ (the successor to WGBS-FM), which became 96X (and a call letter change to WMJX) on October 1, 1975
Edited sentence: In the early 1970s, the 96.3 signal was home to a very successful Top 40 CHR station, known as 96 WMYQ (the successor to WGBS-FM, then WJHR), which became 96X (and a call letter change to WMJX) on October 1, 1975