Complex sentence: The series was created by Draper, who served as head writer and production leader which premiered in February 2007, to the channel's highest ratings in seven years for viewers in the 6--11 age group.
Split into simpler sentences: The series was created by Draper, who served as head writer and production leader. It premiered in February 2007, to the channel's highest ratings in seven years for viewers in the 6--11 age group.