Complex sentence: Carma Labs began producing the product in squeezable tubes in 1988, then in 1989 the traditional stick form which had been the longtime domain of ChapStick and Blistex, Carma's major competitors in the lip balm market.
Split into simpler sentences: Carma Labs began producing the product in squeezable tubes in 1988. In 1989 it began producing it in stick form which had been the longtime form factor for ChapStick and Blistex, Carma's major competitors in the lip balm market.