Complex sentence: According to the RKD he was a pupil of Jan Ebbelaar and the history painter Gerrit Rademaker and he made copies after old masters and was a jeweler and etcher as well as a painter.
Split into simpler sentences: According to the RKD, he was a pupil of Jan Ebbelaar and the history painter Gerrit Rademaker. He made copies of old masters and was a jeweler and etcher as well as a painter.