Complex sentence: The LG series are introduced in 1942, with a starting line-up of LG-1, LG-2 and LG-3, but LG-1 and LG-3 stopped production almost immediately after their debut, until they were re-introduced in 1945.
Split into simpler sentences: The LG series were introduced in 1942, with a starting line-up of LG-1, LG-2 and LG-3. However, LG-1 and LG-3 stopped production almost immediately after their debut, until they were re-introduced in 1945.