Complex sentence: Since the 2008-2009 school year, the school has been led by Ian Neviaser as principle and Kristina Martineau as associate principle Spring 2010, Martineau left on maternity leave and is being replaced by the interim athletic director, Hank.
Split into simpler sentences: Since the 2008-2009 school year, the school has been led by Ian Neviaser as principle and Kristina Martineau as associate principle. In Spring 2010, Martineau left on maternity leave and is being replaced by the interim athletic director, Hank.