Complex sentence: On May 19,2009, ESPN announced it had reached a carriage agreement with Comcast, which allows the cable provider to carry ESPNU on a widely distributed digital cable tier, instead of a less popular sports tier.
Split into simpler sentences: On May 19,2009, ESPN announced it had reached a deal with Comcast to carry the channel on the cable provider. The deal allows Comcast to carry ESPNU on a widely distributed digital cable tier, instead of a less popular sports tier.