Complex sentence: Boyata sustained an ankle injury in the 2-0 loss to Sunderland on 22 October and the injury, which will keep him out for six weeks, means that Boyata, as part of his loan agreement, returns to Manchester City for treatment.
Split into simpler sentences: Boyata sustained an ankle injury in the 2-0 loss to Sunderland. The injury will keep him out for six weeks and means that Boyata, as part of his loan agreement, returns to Manchester City for treatment.