Simplify the following text for a Grade 5 native English-speaking person.
Original: Before 1508 he had painted several altar-pieces for the Castle Church at Wittenberg in competition with Albrecht DÃ 1\/4 rer , Hans Burgkmair and others ; the duke and his brother John were portrayed in various attitudes and a number of his best woodcuts and copper-plates were published .
Simplified: Before 1508 he had painted a few altar-pieces for the Castle Church at Wittenberg . Albrecht DÃ 1\/4 rer , Hans Burgkmair and others also worked there .