Complex sentence: The main island lies 80 km (50 miles) east of Nassau, and it is a long and thin island--180 km (110 miles) long and little more than 1.6 km (1.0 mile) wide at its narrowest.
Split into simpler sentences: The main island lies 80 km (50 miles) east of Nassau. It is a long and thin island--180 km (110 miles) long and little more than 1.6 km (1.0 mile) wide at its narrowest.