Complex sentence: In the summer of 1836, Stanton's mother also fell ill. Despite his own ailments, Stanton hurried to Steubenville, where he found that his sister had left school to become a housekeeper and tend to their mother.
Split into simpler sentences: In the summer of 1836, Stanton's mother also fell ill. Despite being sick himself, he hurried home. In Steubenville, Stanton found that his sister had left school to become a housekeeper and tend to their mother.