Complex sentence: Unable to incite him to attack first, Afzal Khan moved his army to Pratapgad; as he had once been the subhedhar of Wai, he had experience with the geography of the region.
Split into simpler sentences: Unable to incite him to attack first, Afzal Khan moved his army to Pratapgad. As he had once been the subedar of Wai, he had experience with the geography of the region.