Complex sentence: Johnson attended St. Patrick High School in Elizabeth, New Jersey during the 2010--11 school year, once coach Kevin Boyle left for Montverde Academy, Johnson followed his coach, where he had to sit out the 2011--12 season due to the transfer.
Split into simpler sentences: Johnson attended St. Patrick High School in Elizabeth, New Jersey. During the 2010--11 school year, once coach Kevin Boyle left for Montverde Academy, Johnson followed his coach, where he had to sit out the 2011--12 season due to the transfer.