Complex sentence: Cornell is noted for her major Broadway roles in serious dramas, often directed by her husband, Guthrie McClintic; the couple formed a production company, which gave them complete artistic freedom in choosing and producing plays.
Split into simpler sentences: Cornell is noted for her major Broadway roles in serious dramas, often directed by her husband, Guthrie McClintic. Together, they formed a production company, which gave them complete artistic freedom in choosing and producing plays.