Complex sentence: Ambrogio Lorenzetti (or Ambruogio Laurati) (c.1290-1348) was a Sienese painter, he was born and died in Siena.
Split into simpler sentences: Ambrogio Lorenzetti (or Ambruogio Laurati) (c.1290-1348) was a Sienese painter. He was born and died in Siena.