Complex sentence: Apostasy and rebellion in central Arabia was led by Musailima, a self proclaimed prophet, in the fertile region of Yamamah, he was mainly supported be the powerful tribe of Banu Hanifa.
Split into simpler sentences: Apostasy and rebellion in central Arabia was led by Musailima, a self proclaimed prophet, in the fertile region of Yamamah. He was mainly supported by the powerful tribe of Banu Hanifa.