Complex sentence: Gallagher starred in three plays by David Lindsay-Abaire including on Broadway as Moritz in "Spring Awakening" in which he won a 2007 Tony Award for Best performance by a featured actor in a musical.
Split into simpler sentences: Gallagher starred in three plays by David Lindsay-Abaire. Then he starred on Broadway as Moritz in "Spring Awakening" in which he won a 2007 Tony Award for Best performance by a featured actor in a musical.