Complex sentence: Jakob's journalistic career started when he became an editor in Penabur weekly in 1956, and then established Intisari magazine in 1963 with his partner and also fellow journalism, P.K. Ojong, which was inspired by US' Reader's Digest magazine.
Split into simpler sentences: Jakob's journalistic career started when he became an editor in Penabur weekly in 1956. In 1963, he established Intisari magazine with his business partner and also fellow journalist, P.K. Ojong, which was inspired by US' Reader's Digest magazine.