Complex sentence: Joan Blaeu (23 September 1596--28 May 1673) was a Dutch cartographer born in Alkmaar, the son of cartographer Willem Blaeu.
Split into simpler sentences: Joan Blaeu (23 September 1596--28 May 1673) was a Dutch cartographer. He was born in Alkmaar, the son of cartographer Willem Blaeu.