Complex sentence: By then quite famous, Toft was brought to London and studied at length, where under intense scrutiny and producing no more rabbits she confessed to the hoax, and was subsequently imprisoned as a fraud.
Split into simpler sentences: By then quite famous, Toft was brought to London and studied at length. Under intense scrutiny, and producing no more rabbits, she eventually confessed to the hoax and was subsequently imprisoned as a fraud.