Complex sentence: The Classis Germanica was severely limited by the low water level of the Rhine, as well as the most Batavian and roman auxiliaries proved unreliable and began deserting in large numbers to join the insurgents.
Split into simpler sentences: The Classis Germanica was severely limited by the low water level of the Rhine. Many of the Batavian and Roman auxiliaries proved unreliable and began deserting in large numbers to join the insurgents.