Complex sentence: The Sundarbans is a vast forest in the coastal region of the Bay of Bengal; considered one of the natural wonders of the world, it was recognised in 1997 as a UNESCO World Heritage Site of Bangladesh.
Split into simpler sentences: The Sundarbans is a vast forest in the coastal region of the Bay of Bengal and considered one of the natural wonders of the world. It was recognised in 1997 as a UNESCO World Heritage Site of Bangladesh.