Complex sentence: It claims to have 540,000 properties globally under contract and that it deals with more than 650,000 room nights reservations per day, and in 2013 accounted for more than two thirds of Priceline's revenue.
Split into simpler sentences: It claims to have over 540,000 properties globally under contract and that it deals with more than 650,000 room nights reservations per day. In 2013, it accounted for more than two thirds of Priceline's revenue.