Complex sentence: The football league gradually expanded and the team were allowed to name themselves after their own province in 1957 and then was eventually called Shanghai F.C. By 1961, Shanghai started to establish themselves as a major football team within China when they won their first league title.
Split into simpler sentences: The football league gradually expanded and the team were allowed to name themselves after their own province of Shanghai in 1957. Soon afterwards by 1961, Shanghai started to establish themselves as a major football team within China when they won their first league title.