Complex sentence: Though most insects fold their wings when at rest, dragonflies and some damselflies rest with their wings spread out horizontally, while species such as the caddisflies, stoneflies, alderflies, and lacewings hold their wings sloped roof-like over their backs.
Split into simpler sentences: Though most insects fold their wings when at rest, but Dragonflies and some Damselflies rest with their wings spread out horizontally. While species such as the Caddisflies, Stoneflies, Alderflies, and Lacewings hold their wings sloped roof-like over their backs.