Complex sentence: The first-generation XL-7 was a Suzuki design, and the vehicle was essensially a stretched Grand Vitara with company's 2.7 L V6 engine on a rear wheel drive-based platform with optional four wheel drive.
Split into simpler sentences: The first-generation XL-7 was a Suzuki design and was essentially a stretched Grand Vitara. It had a Suzuki designed 2.7 liter V6 on a rear wheel drive-based platform with optional four wheel drive.