Complex sentence: According to the Sunday Mirror, he changed his name by deed poll in 2002, from Andrew Nassim to James Brandon, the name of a former fellow student at school, though some 3 years older.
Split into simpler sentences: According to the Sunday Mirror, he changed his name by deed poll in 2002, from Andrew Nassim to James Brandon. However, "James Brandon" is also the name of a former fellow student at school, who is some 3 years older.