Complex sentence: Lotta spent the last 15 years of her life at the Brewster Hotel which she had purchased in Boston, where she died September 25,1924 at age 76 from undisclosed causes.
Split into simpler sentences: Lotta spent the last 15 years of her life at the Brewster Hotel which she had purchased in Boston. She died September 25,1924 at age 76 from undisclosed causes.