Complex sentence: One example was sent to Germany for trials where it was found to be mechanically reliable and a powerful and accurate gun platform, however at a weight of 80 tons and a height of it was extremely slow and proved difficult to transport.
Split into simpler sentences: One example was sent to Germany for trials where it was found to be mechanically reliable and a powerful and accurate gun platform. However, at a weight of 80 tons and a height of it was extremely slow and proved difficult to transport.