Complex sentence: At the 1947 TT, the company won the first four places in the Junior race, in 1949 they were the first FIM 350cc World Champions, a feat which they repeated in 1950.
Split into simpler sentences: At the 1947 Isle of Man TT the company won the first four places in the Junior race. In 1949 they were the first FIM 350cc World Champions, a feat which they repeated in 1950.