Complex sentence: She most often appeared in films directed by William C. Dowlan like "The Mayor's Decision" (1915), "The Devil and Idle Hands" (1915), and "Drugged Waters" (1916).
Split into simpler sentences: She most often appeared in films directed by William C. Dowlan. Among these are "The Mayor's Decision" (1915), "The Devil and Idle Hands" (1915), and "Drugged Waters" (1916).