Complex sentence: The Italian automotive industry started in the late 1889s, with the Stefanini-Martina regarded as the first manufacturer although Enrico Bernardi had built a petrol fueled tri-cycle in 1884.
Split into simpler sentences: The Italian automotive industry started in the late 1889s, with the Stefanini-Martina thought to be the first manufacturer. However, Enrico Bernardi had built a petrol fueled tri-cycle car in 1884.