Complex sentence: Design flaws, including dangerous stresses at the corners of the square windows and installation methodology, were ultimately identified; consequently the Comet was extensively redesigned with oval windows, structural reinforcement and other changes.
Split into simpler sentences: Design flaws, including dangerous stresses at the corners of the square windows and installation methodology, were ultimately identified. As a result, the Comet was extensively redesigned with oval windows, structural reinforcement and other changes.