Complex sentence: Prior to 2013, the CHA tournament was hosted at a predetermined site; starting in 2013, the two first round series are each played at the home of the higher seed, with the semifinals and final held at the home of the number one seed.
Split into simpler sentences: Prior to 2013, the CHA tournament was hosted at a predetermined site. From 2013--2015, the two first round series were each played at the home of the higher seed, with the semifinals and final held at the home of the number one seed.