Complex sentence: In 1553, he became a physician to the count of Henneberg, Saxe-Meiningen; in 1558, he took the same post with Otto Henry, Elector Palatine; he held this post concurrently with a separate position as a professor of medicine at Heidelberg.
Split into simpler sentences: In 1553, he became a physician to the count of Henneberg, Saxe-Meiningen. He held this post concurrently with a separate position as a professor of medicine at Heidelberg.