Complex sentence: Robert Eadie established himself as a successful professional painter, engraver and book illustrator, and he also received commissions from the management of Glasgow's theatres for paintings of theatres and paintings with theatrical themes.
Split into simpler sentences: Robert Eadie established himself as a successful professional painter, engraver and book illustrator. He received commissions from the management of Glasgow's theatres for paintings of theatres and paintings with theatrical themes.