Complex sentence: At a certain point in the level, one can ski straight down without turning, not hit any obstacles and avoid the snow monster, at this point a new level starts with 5 monsters on either side of you and no possible way to escape.
Split into simpler sentences: At a certain point in the level, one can ski straight down without turning, not hit any obstacles and avoid the snow monster. At this point, a new level starts with 5 monsters on either side of you and no possible way to escape.