Complex sentence: Sherman was an illustrator, educator, self-taught ornithologist and writer who commisioned the build of the Chimney Swifts' Tower which allowed her to be the first to study and demonstrate the life cycle of Chimney Swifts.
Split into simpler sentences: Sherman was an illustrator, educator, self-taught ornithologist and writer. She commisioned the build of the Chimney Swifts' Tower which allowed her to be the first to study and demonstrate the life cycle of Chimney Swifts.