Complex sentence: Beurle informed them they must not land yet because the British had lodged a diplomatic protest over their actions and an British delegation was at the airfield, with agreement of the German government, to inspect the ship.
Split into simpler sentences: Beurle informed them they must not land yet because the English had lodged a diplomatic protest over their actions. Furthermore an English delegation was at the airfield, with agreement of the German government, to inspect the ship.