Complex sentence: The firm was founded in 1892 by Frans Wilhelm Lindqvist and Johan Viktor Svenson, the developers of its initial product, the Primus stove, the first portable and soot-free kerosene stove.
Split into simpler sentences: The firm was founded in 1892 by Frans Wilhelm Lindqvist and Johan Viktor Svenson. They were the developers of its initial product, the Primus stove, the first portable and soot-free kerosene stove.