Complex sentence: The win against the Falcons in the divisional round was their first playoff win since 2008, but the Eagles were the first No.1 seed in the playoffs since to be an underdog in the Divisional Round, as well as in the conference championship.
Split into simpler sentences: The win against the Falcons in the divisional round was their first playoff win since 2008. The Eagles were the first No.1 seed in the playoffs since to be an underdog in the Divisional Round, as well as in the Conference Championship.