Complex sentence: Peer-reviewed research into the efficacity of E. grandilflorum as an aphrodisiac is lacking, however the herb has been used for this purpose in Chinese medicine and is a common ingredient of'herbal' remedies for impotence.
Split into simpler sentences: Peer-reviewed research into the efficacy of "E. grandiflorum" as an aphrodisiac is lacking. However the herb has been used for this purpose in traditional Chinese medicine and is a common ingredient of herbal remedies for impotence.