Complex sentence: A few homologous sets of proteins are well-known morphogens in many species, such as Decapentaplegic, Hedgehog, Wingless, Notch, epidermal growth factor, and fibroblast growth factor.
Split into simpler sentences: A few homologous sets of proteins are well-known morphogens in many species. These are morphogens such as Decapentaplegic, Hedgehog, Wingless, Notch, epidermal growth factor, and fibroblast growth factor.