Complex sentence: The 1653 Stationers'Register entry was made by the bookseller Humphrey Moseley, who was known to have falsely used Shakespeare's name in other such entries.
Split into simpler sentences: The 1653 Stationers'Register entry was made by the bookseller Humphrey Moseley. Moseley is not necessarily to be trusted as he is known to have falsely used Shakespeare's name in other such entries.