Complex sentence: In 1978, at the age of 33, Channing took on what would be her trademark role as high school teenager Betty Rizzo in the hit musical film "Grease", which earned her the People's Choice Awards for Favorite Motion Picture Supporting Actress.
Split into simpler sentences: In 1978, at the age of 33, she took on the role of high school teenager Betty Rizzo in the hit musical "Grease". Her performance earned her the People's Choice Awards for Favorite Motion Picture Supporting Actress.