Complex sentence: Today, the tiny Tünel is rarely useful for most of Istanbul's population-a larger (but separate) metro system is available, and other public transportation options include buses, cabs, and even a cable car.
Split into simpler sentences: Today, the tiny Tünel is rarely useful for most of Istanbul's population. A larger (but separate) metro system is available, and other public transportation options include buses, cabs, and even a cable car.