Complex sentence: During June 1969, Enzo Ferrari sold half of his company to Fiat to finance the construction of the required 25 cars to compete with the Porsche 917; the Ferrari 512, powered by a 5.0L V12, was introduced for the 1970 season.
Split into simpler sentences: During June 1969, Enzo Ferrari sold half of his company to Fiat. Ferrari used some of that money to build 25 cars in order to compete with the Porsche 917; the Ferrari 512, powered by a 5.0L V12, was introduced for the 1970 season.