Complex sentence: Week 15 saw them beat the hapless Redskins 33-30 and then lose a meaningless game in Arizona followed by a meaningless win over the Eagles to end their season 6-10.
Split into simpler sentences: Week 15 saw them beat the hapless Redskins 33-30. The Cowboys then lost a meaningless game in Arizona and followed that with a meaningless win over the Eagles to end their season at 6-10.