Complex sentence: McAllister's success continued into 2003--04, where he scored another twenty-eight goals in fifty-five appearances, this earned him a trial with Queens Park Rangers in the Football League Championship, just one level down from the Premier League.
Split into simpler sentences: McAllister's success continued into 2003--04, where he scored another twenty-eight goals in fifty-five appearances. This success earned him a trial with Queens Park Rangers in the Football League Championship, just one level down from the Premier League.