Complex sentence: Beert began his career as a still-life painter when he became a master of the Antwerp guild in 1602; however none of his works are dated, although some of the copper plates were stamped with dates from 1606 to 1609 by their supplier.
Split into simpler sentences: Beert began his career as a still-life painter when he became a master of the Antwerp guild in 1602. However none of his works are dated, although some of the copper plates were stamped with dates from 1606 to 1609 by their supplier.