original: It was formerly one of the products of gasworks.
simplifications: It use to be one of the products of gasworks. It used to be part of gasworks. It was once a gasworks product. It used to be a product of gasworks. It used to be one of the products of gasworks. It was originally a product of gasworks. It used to be made by gasworks. It used to be a product of gasworks. In the past, it was one of the products of gasworks. Formerly one of the products of the gas works.