Complex sentence: Henry's parents had a big influence on his artistic upbringing; they took him to watch local plays on Sundays, as well as put him through painting and drama school growing up, causing him to engage in the performing arts at an early age.
Split into simpler sentences: Henry's parents had a big influence on his artistic upbringing. Taking him to watch local plays on Sundays, as well as putting him through painting and drama school growing up, causing him to engage in the performing arts at an early age.