Complex sentence: Lukits began his professional career as an illustrator while still in his teens, but he was also a still life painter, muralist and founder of the Lukits Academy of Fine Arts in Los Angeles for more than sixty years.
Split into simpler sentences: Lukits began his professional career as an illustrator while still in his teens. He was a still life painter, muralist and founder of the Lukits Academy of Fine Arts in Los Angeles for more than sixty years.