Complex sentence: Triterpenoids possess a rich chemistry and pharmacology (e.g. cholesterol) with several pentacyclic motifs; particularly lupane, oleanane and ursane showing promise as anti-cancer agents.
Split into simpler sentences: Triterpenoids possess a rich chemistry and pharmacology (e.g. cholesterol) with several pentacyclic motifs. Lupane, oleanane and ursane show particular promise as anti-cancer agents.