Complex sentence: Giovanna Garzoni (1600-1670) was an Italian painter of the Baroque era, unusual for Italian painters in that her thematic were mainly decorative and luscious still-lifes of fruits, vegetables, and flowers, and because she was a woman.
Split into simpler sentences: Giovanna Garzoni (1600-1670) was an Italian painter of the Baroque era. She was unusual for Italian artists of the time for two reasons: first, in that her thematic were mainly decorative and luscious still-lifes of fruits, vegetables, and flowers, and second, because she was a woman.