Complex sentence: Blankets are distinguished from sheets by their thickness and purpose; the thickest sheet is still thinner than the lightest blanket, because blankets are for warmth, while sheets are for hygiene, comfort and aesthetics.
Split into simpler sentences: Blankets are distinguished from sheets by their thickness and purpose; the thickest sheet is still thinner than the lightest blanket. This is because blankets are for warmth, while sheets are for hygiene, comfort and aesthetics.