Complex sentence: Throughout 1956-1959 at the National Art School in East Sydney, Whiteley attended drawing classes, this is where he met his future wife Wendy Julius and became one of Whiteley's main subjects for his works.
Split into simpler sentences: Throughout 1956-1959 at the National Art School in East Sydney, Whiteley attended drawing classes. This is where Whiteley met his future wife, Wendy Julius, and she became one of Whiteley's main subjects for his works.