Complex sentence: Many stages are also multi-tiered: to get to other areas of the stage, one character must be knocked off a ledge and fall into the next area; these falls deal usually fairly high damage, but cannot knock the opponent out.
Split into simpler sentences: Many stages are also multi-tiered: to get to other areas of the stage, one character must be knocked off a ledge and fall into the next area. These falls deal usually fairly high damage, but cannot knock the opponent out.