Complex sentence: They were the Duo 210,230,250,270c, 280,280c, and 2300c, with the 210 and 230 being the earliest, and 2300c being the final incarnation before the entire line was dropped in early 1997.
Split into simpler sentences: They were the Duo 210,230,250,270c, 280,280c, and 2300c. With the 210 and 230 being the earliest, and 2300c being the final incarnation before the entire line was dropped in early 1997.