Complex sentence: Tejon Ranch Company is the largest landowner in California, incorporated in 1936 to organise the ownership of a large tract of land originally comprised of four Mexican land grants, and began ranching in the 1840's.
Split into simpler sentences: Tejon Ranch Company is the largest landowner in California. It was incorporated in 1936 to organise the ownership of a large tract of land originally comprised of four Mexican land grants, and began ranching in the 1840's.