Complex sentence: Handmade skins are usually better prepared for artists and have fewer oily spots which can cause long-term cracking of paint than mass-produced parchment, which is usually made for lamp shades, furniture, or other interior design purposes.
Split into simpler sentences: Handmade skins are usually better prepared for artists and have fewer oily spots which can cause long-term cracking of paint than mass-produced parchment. Mass-produced parchment is usually made for lamp shades, furniture, or other interior design purposes.