Complex sentence: Marie Annonson is a retired elite acrobatic gymnast who is currently owner and head coach at the acrobatic gymnastics facility West Coast Training Center in Livermore, California, which is home to the 2011 U.S. mixed-pairs champions, Cassie Lim & Brian Kincher.
Split into simpler sentences: Marie Annonson is a retired elite acrobatic gymnast who is currently owner and head coach at the acrobatic gymnastics facility West Coast Training Center in Livermore, California. The current roster of WCTC athletes includes the 2011 U.S. mixed-pairs champions, Cassie Lim & Brian Kincher.