Complex sentence: He was educated at Mowbray Public School where he became the School Captain in 2009, he furthered his education at Chatswood High School where he was heavily involved in extra-curricular school service roles.
Split into simpler sentences: He was educated at Mowbray Public School where he became the School Captain in 2009. He furthered his education at Chatswood High School where he was heavily involved in extra-curricular school service roles.