Complex sentence: After a few years, Ruhrpumpen GmbH merged with Thyssen AG a global company, from then on Ruhrpumpen was part of Thyssen Industries AG and become known all over the world.
Split into simpler sentences: After a few years, Ruhrpumpen GmbH merged with Thyssen AG a global company. Ruhrpumpen became a part of Thyssen Industries AG and become known throughout the world.