Complex sentence: The He 177 can be compared with the Boeing B-29 Superfortress which also took about two years to have its problems ironed out, after which it found success however the He 177 was never to achieve its full potential.
Split into simpler sentences: The He 177 can be compared with the Boeing B-29 Superfortress which also took about two years to have its problems ironed out, after which it found success. However the He 177 was never to achieve its full potential.