Complex sentence: Since its inception, EPIX has been a leader in TV Everywhere; it was the first premium network to make its films available for streaming (beginning with the network's launch in 2009, its films were available via EPIX.com).
Split into simpler sentences: Since its inception, EPIX has been a leader in TV Everywhere. It was the first premium network to make its films available for streaming (beginning on the network's launch in 2009, its films were available via EPIX.com).