Complex sentence: They included Eyebrook Reservoir, near Uppingham, Rutland, Abberton Reservoir near Colchester and Derwent Reservoir and some of the earliest flights made by the new 617 Squadron, were reconnaissance flights over these bodies of water.
Split into simpler sentences: They included Eyebrook Reservoir, near Uppingham, Rutland, Abberton Reservoir near Colchester, and Derwent Reservoir. As a result, some of the earliest flights made by the new 617 Squadron, as it was now known, were reconnaissance flights over these bodies of water.