Complex sentence: "Meyer & Studeli" (MST) units have become a reputable movement brand before World War I. By 1923, production grew to one million units, in 1940 the company started its own dial production line.
Split into simpler sentences: Meyer & Studeli (MST) units became a reputable brand before World War I. By 1923, production grew to one million units. In 1940 the company started its own dial production line.