Complex sentence: As an art student he was tutored by Antonio Dattilo Rubbo at the Royal Art Society of New South Wales and at the East Sydney Technical College, who had also been his art master at Newington.
Split into simpler sentences: As an art student he was tutored by Antonio Dattilo Rubbo at the Royal Art Society of New South Wales and at the East Sydney Technical College. Rubbo had also been his art master at Newington.