Complex sentence: His first novel was "Geography Club", about teenagers who secretly start a gay-straight alliance at their high school, which was challenged in some American schools, including schools in Hartinger's home town of Tacoma.
Split into simpler sentences: His first novel was "Geography Club", about teenagers who secretly start a gay-straight alliance at their high school. It has been challenged in some American schools, including a school in Hartinger's home town of Tacoma.