Complex sentence: Symons studied pure mathematics and computer science at The University of Melbourne and lived at Queen's College, earning a Bachelor of Science degree (In 4 years, not 3) before joining seminal Australian rock band Skyhooks as a guitarist in the 1970s.
Split into simpler sentences: Symons studied pure mathematics and computer science at the University of Melbourne, during which time he resided at Queen's College and earned a Bachelor of Science degree in four, not three, years. After graduating, Symons joined the Australian rock band Skyhooks as a guitarist in the 1970s.