Complex sentence: Several studies have questioned the basis for the protocol and have recomended abandoning it, however bioethicist Jacob M. Appel of New York University has said that the protocol is a success and should be expanded.
Split into simpler sentences: Several studies have questioned the basis for the protocol and have recomended abandoning it. Bioethicist Jacob M. Appel of New York University has said that the protocol is a success and should be expanded.