Complex sentence: The track is also the site of the annual Rolex Monterey Motorsports Reunion, formerly known as the Monterey Historic Automobile Races event sponsored every August by Rolex that sees an extraordinarily eclectic mixture of race cars on the course.
Split into simpler sentences: The track is also the site of the annual Rolex Monterey Motorsports Reunion, formerly known as the Monterey Historic Automobile Races. The event features an extraordinarily eclectic mixture of race cars on the course.