Complex sentence: Mary Dawson Turner, before her marriage Mary Palgrave (1774--1850), was an English artist, She known for her series of portraits, making etchings from drawings collected by her husband.
Split into simpler sentences: Mary Dawson Turner, before her marriage Mary Palgrave (1774--1850), was an English artist. She is known for her series of portraits, making etchings from drawings collected by her husband.