Complex sentence: The orphenadrine salt used for Parkinsonism is the hydrochloride, whereas the muscle relaxant tablet are the citrate, and manufacturers' descriptions of orphenadrine indicate that the salts are not interchangeable; one reason may be that the citrate can be irritating when injected.
Split into simpler sentences: The orphenadrine salt used for Parkinsonism is the hydrochloride, whereas the muscle relaxant tablet are the citrate. The manufacturers' descriptions of orphenadrine indicate that the salts are not interchangeable; one reason may be that the citrate can be irritating when injected.