Complex sentence: He has been in and out of the first team since making his debut against Dagenham & Redbridge in 2001, this season has seen Glenn become a understudy to first choice keeper Glyn Garner.
Split into simpler sentences: He has been in and out of the first team since making his debut against Dagenham & Redbridge in 2001. In the 2006--07 season, Morris become an understudy to first choice keeper Glyn Garner.