Complex sentence: The shift caught Lionel off guard, and, in 1957, they hastily introduced a line of HO-scale trains licensed from Rivarossi and a line of slot car racing sets, neither product line was as popular as its O-gauge trains.
Split into simpler sentences: The shift caught Lionel off guard, and, in 1957, they hastily introduced a line of HO-scale trains licensed from Rivarossi and a line of slot car racing sets. Neither product line was as popular as its O-gauge trains.