Complex sentence: His new company was originally christened Eureka Glass Company before a later name change to the current name, and, until the arrival of his son William H. Blenko in 1923, he had no employees, making and selling all of his glass himself.
Split into simpler sentences: His new company was originally christened Eureka Glass Company before a later name change to the current name. Until the arrival of his son William H. Blenko in 1923, he had no employees, making and selling all of his glass himself.