Complex sentence: He trained as an aeronautical engineer at the Technical University at Hanover, and subsequently joined the German Arado Flugzeugwerke in the mid- 1920s, where he was involved in the design of the Ar 95, Arado Ar 96, and Ar 196.
Split into simpler sentences: He trained as an aeronautical engineer at the Technical University at Hanover, and subsequently joined the German Arado Flugzeugwerke in the mid- 1920s. He was involved in the design of the Arado Ar 96, Ar 95 and also the Ar 196.