Original: Pope Innocent IV returns to Rome, having left 9 years earlier in 1244 to depose Frederick II, Holy Roman Emperor, and being unable to return until after Frederick's death, due to the agitation throughout Europe caused by that action.
Simplified: Pope Innocent IV returns to Rome, having left nine years earlier in 1244 to depose Frederick II, Holy Roman Emperor, and being unable to return until after Frederick's death due to the agitation throughout Europe caused by that action.