Complex sentence: He signed with Premier League club Portsmouth in 2006, then went on to play in England's top flight for Manchester City, Sunderland and Blackburn Rovers before returning to Portsmouth in 2011.
Split into simpler sentences: He signed with Premier League club Portsmouth in 2006. He then went on to play in England's top flight for Manchester City, Sunderland and Blackburn Rovers before returning to Portsmouth in 2011.