Complex sentence: A fourth flying boat (the M-156) called the "Russian Clipper" was built for the Soviet Union, similar to the M-130 except for a larger wing (giving it a longer range) and twin vertical stabilizers.
Split into simpler sentences: A fourth flying boat (the M-156) called the "Russian Clipper" was built for the Soviet Union. It was similar to the M-130 but had a larger wing (giving it greater range) and twin vertical stabilizers.