Complex sentence: In 2007, Mazda produced almost 1.3 million vehicles for global sales, the majority of which (nearly 1 million) were produced in the company's Japanese plants, with the remainder coming from a variety of other plants worldwide.
Split into simpler sentences: In 2007, Mazda produced almost 1.3 million vehicles for global sales. The majority of these (nearly 1 million) were produced in the company's Japanese plants, with the remainder coming from a variety of other plants worldwide.