Complex sentence: Later that month, he moved back up to the Conference South to join the academy at Chelmsford City, progressing to make 11 first team appearances before leaving at the end of the 2013--14 season.
Split into simpler sentences: Later that month, he moved back up to the Conference South to join the academy at Chelmsford City. With Chelmsford City, Greene progressed to make 11 first team appearances before leaving at the end of the 2013--14 season.