Complex sentence: The Seahawks defeated the New Orleans Saints 23--15 in the Divisional round, the San Francisco 49ers 23--17 in the NFC Championship, and defeated the Denver Broncos 43-8 in Super Bowl XLVIII for their first Super Bowl win in franchise history.
Split into simpler sentences: The Seahawks defeated the New Orleans Saints 23--15 in the Divisional round and the San Francisco 49ers 23--17 in the NFC Championship. During Super Bowl XLVIII, they defeated the Denver Broncos 43-8 for their first Super Bowl victory in franchise history.