Complex sentence: More than 80% of all the material used is from the polyethylene family: cross-linked polyethylene (PE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE).
Split into simpler sentences: More than 80% of all the material used is from the polyethylene family. Cross-linked polyethylene (PE); linear low density polyethylene (LLDPE); high density polyethylene (HDPE).