Complex sentence: Bangor then experienced a downward trajectory, finishing fourth in 2013-14 and tenth in 2014-15, a season during which the side was in real danger of relegation for much of the season.
Split into simpler sentences: Bangor then experienced a downward trajectory, finishing fourth in 2013-14. It heralded a slide during which the side was in real danger of relegation for much of the season.