Complex sentence: Since that time, she has coached students at Central Kitsap High School for the annual YMCA Mock Trial Competition and team-taught the Street Law Program at Central Kitsap High School.
Split into simpler sentences: Since that time, she has coached students at Central Kitsap High School for the annual YMCA Mock Trial Competition. Since then, she has team-taught the Street Law Program at Central Kitsap High School.