Complex sentence: Quassinoids, the biologically active components of "E. longifolia" root, are bitter, and named after quassin, the long-isolated bitter principle of the quassia tree.
Split into simpler sentences: Quassinoids, the biologically active components of "E. longifolia" root, are bitter. They are named after quassin, the long-isolated bitter principle of the quassia tree.