Complex sentence: First described by the English explorer Sir Walter Raleigh in 1596, its 50 km 2 summit area, defended by 400 metre or higher cliffs on all sides, includes the triple border point of Venezuela, Brazil and Guyana.
Split into simpler sentences: First described by the English explorer Sir Walter Raleigh in 1596, its summit area is defended by 400-metre-tall cliffs on all sides. The mountain includes the triple border point of Venezuela, Brazil and Guyana.