Complex sentence: Ranulf failed to deliver Nocera from a siege and Robert of Capua fled north, by June 1134, Ranulf's own supporters had melted away and he was forced to make peace with the king.
Split into simpler sentences: Ranulf failed to deliver Nocera from a siege and Robert of Capua fled north. By June 1134, Ranulf's own supporters had melted away and he was forced to make peace with the king.