Complex sentence: On January 13 of 27 BC, Octavian transferred control of the state back to the Senate and the People of Rome, Abbott, 267 but neither the Senate nor the People of Rome were willing to accept what was, in effect, Octavian's resignation.
Split into simpler sentences: On January 13,27 BC, Octavian transferred control of the state back to the Senate and the People of Rome. Neither the Senate nor the People of Rome were willing to accept what was, in effect, Octavian's resignation.