Complex sentence: The company was established by the Cleaver family in 1770, the official date displayed on its product labels, though according to the company's website, an earlier incarnation existed prior this, most records of which were lost in the Great Fire of London of 1666.
Split into simpler sentences: The company was established by the Cleaver family in 1770, the official date displayed on its product labels. According to the company's website an earlier incarnation existed prior to this but most records of the earlier company were lost in the Great Fire of London of 1666.