Complex sentence: The angled wheels are effective in dealing with the tight bends common on DLR routes that these trains have to take, a downside is that they are partly responsible for violent shaking as the train travels at higher speeds on the straight parts of the route.
Split into simpler sentences: The angled wheels are effective in dealing with the tight bends common on DLR routes that these trains have to take. However, a to this inovation downside is that they are partly responsible for violent shaking as the train travels at higher speeds on the straight parts of the route.