Simplify the following text for a Grade 6 native English-speaking person.
Original: Based on the Fiat Tipo 3 , it was a four-door seven-seat sedan powered by a front-mounted 26 k 2.8 litre straight-4 engine driving the rear wheels , and was capable of speeds up to 20 m. 22 were built at the company 's Kobe shipyard , including prototypes , between 1917 and 1921 .
Simplified: Based on the Fiat Tipo 3 , it was a four-door seven-seat sedan powered by a front-mounted 26kW 2.8 litre straight-4 engine driving the rear wheels , and was could drive as fast as 20 mph . 22 were built at the company 's Kobe shipyard between 1917 and 1921 .