Complex sentence: By 1901 Olds had built 11 prototype vehicles, including at least one of each power mode: steam, electricity, and gas; the only American automotive pioneer to produce and sell at least one of each mode of automobile.
Split into simpler sentences: By 1901 Olds had built 11 prototype vehicles, including at least one of each power mode: steam, electricity and gasoline. He was the only American automotive pioneer to produce and sell at least one of each mode of automobile.