Complex sentence: Wal-Mart's "Vudu" streaming service became the second UltraViolet retailer by adding UV rights to thousands of films and it also launched a Disc to Digital service, with more than 4000 titles initially.
Split into simpler sentences: Wal-Mart's "Vudu" streaming service became the second UltraViolet retailer by adding UV rights to thousands of films. They also launched a Disc to Digital service, with more than 4000 titles initially.