Complex sentence: Also among the first commercial IBM-compatible laptops were the IBM PC Convertible, introduced in 1986, and two Toshiba models, the T1000 and T1200, introduced in 1987.
Split into simpler sentences: Also among the first commercial IBM-compatible laptops was the IBM PC Convertible, introduced in 1986. Two Toshiba models, the T1000 and T1200, were introduced in 1987.