Complex sentence: Nevertheless, he was the first to use gasoline for propelling a vehicle in the simple handcart of 1870 (First Marcus Car), but it is uncertain if the famous Second Marcus Car ever ran before 1890.
Split into simpler sentences: Nevertheless, he was the first man who used gasoline for propelling a vehicle in the simple handcart of 1870 (First Marcus Car). But it is not sure if the famous Second Marcus Car ever ran before 1890.