Complex sentence: The Sir John Leman High School has a large number of student run bands and groups, including Plan Nine, who have gone on to enjoy an increasing level of prominence, releasing their first E.P in March 2008.
Split into simpler sentences: The Sir John Leman High School has a large number of student run bands and groups. Another notable band formed whilst its members attended the school is Plan Nine, who have gone on to enjoy an increasing level of prominence, releasing their first E.P in March 2008.