Complex sentence: Prior to the 2014 Belmont Stakes, California Chrome's owners filed a patent application to trademark his name for use on athletic apparel, and hired two talent agencies to help with marketing and sponsorships.
Split into simpler sentences: Prior to the 2014 Belmont Stakes, California Chrome's owners filed a patent application to trademark his name for use on athletic apparel. They hired two talent agencies to help with marketing and sponsorships.