Complex sentence: However, Ali Parvin is widely regarded as the club's greatest ever player, he played 18 years with the club from 1970 to 1988, and had his number 7 retired by Persepolis.
Split into simpler sentences: However, Ali Parvin is widely regarded as the club's greatest ever player. Parvin played 18 years with the club from 1970 to 1988, and had his number 7 retired by Persepolis.