Complex sentence: After three seasons, Muhsin left the team and Jamal Salih became the new manager, leading the team to promotion in the 1974--75 season by calling some players from Montakhab Jameaat Baghdad, who won the 1975 Universities League, to strengthen the team.
Split into simpler sentences: After three seasons, Muhsin left the club and Jamal Salih became the new manager, leading the team to promotion in the 1974--75 season. He introduced some players from Montakhab Jameaat Baghdad, who won the 1975 Universities League, to strengthen the team.