Complex sentence: Ludovico di Varthema, also known as Barthema and Vertomannus (c.1470-1517) was a famous Italian traveller and diarist, noted for being the first European non-Muslim known to enter Mecca as a pilgrim.
Split into simpler sentences: Ludovico di Varthema, also known as Barthema and Vertomannus (c.1470-1517) was an Italian traveller and writer. He was the first European non-Muslim known to have entered Mecca as a pilgrim.