Complex sentence: Morrison grew up in Haverhill, Suffolk, attending Castle Manor School, and started his career at Cambridge United where he came through their youth academy and at the age of 15 became the youngest player to ever feature for their reserve side.
Split into simpler sentences: Morrison grew up in Haverhill, Suffolk, attending Castle Manor School. He started his football career with Cambridge United, where he came through their youth academy and at the age of 15 became the youngest player to ever feature for their reserve side.