Complex sentence: The girls' tennis team won the Division I State Championship in 2011,2012,2014, and 2015, and has been the champion of the Ohio Capital Conference (Cardinal Division) 13 years in a row, since 2004.
Split into simpler sentences: The girls' tennis team won the Division I Team State Championship in 2011,2012,2014, and 2015. The Celts have been the champion of the Ohio Capital Conference (Cardinal Division) 13 years in a row, since 2004.