Complex sentence: North Devon's Biosphere Reserve attracts a large number of visitors each year, despite being an hour from the nearest motorway it is visited by 4 million people a year, up to 60,000 a day in August.
Split into simpler sentences: North Devon's Biosphere Reserve attracts a large number of visitors each year. Despite being an hour from the nearest motorway, 4 million people a year visit, up to 60,000 a day in August.