Complex sentence: Triumph Motorcycles produced its first single cylinder unit construction model was the 149cc Terrier launched in 1952 and quickly followed by the more popular 196cc Tiger Cub in 1953.
Split into simpler sentences: Triumph Motorcycles produced its first single cylinder unit construction model with the 149cc Terrier launched in 1952. It was quickly followed by the more popular 196cc Tiger Cub in 1953.