Complex sentence: The Dalton Academy Warblers are an a cappella glee club from a fictional private school in Westerville, Ohio, were first introduced in the "Glee" television episode "Never Been Kissed".
Split into simpler sentences: The Dalton Academy Warblers are an a cappella glee club from a fictional private school in Westerville, Ohio. They were first introduced in the "Glee" television episode "Never Been Kissed".