Complex sentence: The team started 5-0 before losing to the undefeated Patriots, Their three losses came in Week 6 (a home game with the unstoppable Patriots), and in Weeks 15 and 17 against their division rivals Philadelphia and Washington.
Split into simpler sentences: The team started 5-0 before losing to the undefeated Patriots. Besides the loss to the Patriots in Week 6, their only other losses came in Weeks 15 and 17 against their division rivals Philadelphia and Washington.