Complex sentence: Instead they moved upriver, intending to cross at Bonnerville sur Touques but intelligence reported the railway embankment on the river was held in force by the Germans, putting any attempt at crossing the river on hold.
Split into simpler sentences: Instead they moved upriver, intending to cross at Bonnerville sur Touques. Intelligence reported that the railway embankment on the river was held in force by the Germans, and this put attempts to cross the river on hold.