Original sentence: A peace was obtained with the frontiers restored to those defined in treaties of 897 and 904.Once in power Symeon's successor, Peter I (927–969), dispatched a diplomatic mission to Constantinople seeking peace.Simeon's conquests in Thrace were restored to the Byzantine Empire whilst it, in turn, recognised Bulgarian control over inland Macedonia.Under the Bulgarian tsar Simeon the Great (893–927) the city and most of the Byzantine possessions in the Balkans were conquered
Edited sentence: The city remained in Bulgarian hands under Simeon's son, Peter I (927–969).Under tsar Simeon the Great (893–927) the city and most of the Byzantine possessions in the Balkans were conquered by the Bulgarian Empire