Complex sentence: Most high school games are played with four 8-minute quarters, while NCAA, WNBA, and FIBA games are played in four 10 minute quarters and in 2015-2016 the NCAA changed the rules to 10 minute quarters from 20 minute halves.
Split into simpler sentences: Most high school games are played with four 8-minute quarters, while NCAA, WNBA, and FIBA games are played in four 10 minute quarters. In 2015-2016 the NCAA changed the rules to 10 minute quarters from 20 minute halves.