Complex sentence: Another harbinger of change was the introduction of two-stroke engines in competition, with an East German firm named MZ placing respectably in races at the Nürburgring although, few people viewed the two-strokes as a threat to the mighty four-strokes.
Split into simpler sentences: Another harbinger of change was the introduction of two-stroke engines in competition. An East German firm named MZ placing respectably in races at the Nürburgring although, few people viewed the two-strokes as a threat to the mighty four-strokes.