Complex sentence: From Oman, following the orders of Abu Bakr, Ikrimah marched to Mahra, to aid Arfaja bin Harsama, as Arfajar had not yet arrived, Ikrimah, instead of waiting for him, tackled the local apostasy on his own.
Split into simpler sentences: From Oman, following the orders of Abu Bakr, Ikrimah marched to Mahra to aid Arfaja bin Harsama. As Arfajar had not yet arrived, Ikrimah, instead of waiting for him, tackled the local apostasy on his own.