Complex sentence: In 2012 Clemens starred alongside Gregg Sulkin, Cary Elwes and Samantha Mathis in the drama "Camilla Dickinson", an adaptation of the 1951 novel by young-adult fiction author Madeleine L'Engle.
Split into simpler sentences: In 2012 Clemens starred in the drama "Camilla Dickinson", with Gregg Sulkin, Cary Elwes and Samantha Mathis. The film is an adaptation of the 1951 novel by young-adult fiction author Madeleine L'Engle.