Complex sentence: A channel manager is a software solution, in most cases cloud-based, connecting the rates and availability of a hotel with various online travel agencies (OTAs), metasearch engines and Global Distribution Systems (GDSes).
Split into simpler sentences: A channel manager is a software solution, in most cases cloud-based, enabling hotels to manage their distribution in online channels. The hotel typically uses the channel manager to connect rates and availability with online travel agencies (OTAs), metasearch engines and Global Distribution Systems (GDSes).