Complex sentence: The 357 was released as a Honda CR250M in the years 1973 and 1974, and the 381 was released as a CR250M1 in 1975 and as a CR250M'76 in 1976.
Split into simpler sentences: The 357 was released as a Honda CR250M in the years 1973 and 1974. The 381 was released as a CR250M1 in 1975 and as a CR250M'76 in 1976.