Complex sentence: There are two major overlapping classes of organic semiconductors: organic charge-transfer complexes, and various linear-backbone conductive polymers derived from polyacetylene, such as polyacetylene itself, polypyrrole, and polyaniline.
Split into simpler sentences: There are two major overlapping classes of organic semiconductors. These are organic charge-transfer complexes, and various linear-backbone conductive polymers derived from polyacetylene, such as polyacetylene itself and it derivatives polypyrrole, and polyaniline.