Complex sentence: His first serious map, that of Ancient Greece, was published when he s fifteen, and at the age of twenty-two he was appointed one the king's geographers, and began to attract the attention of first authorities.
Split into simpler sentences: His first serious map, that of Ancient Greece, was published when he was fifteen. At the age of twenty-two, he was appointed one the king's geographers, and began to attract the attention of first authorities.