Complex sentence: In 1935 he left Makassar for Medan, North Sumatra, where he became the editor of an Islamic weekly magazine, during which time he wrote "Di Bawah Lindungan Ka'bah", his first novel.
Split into simpler sentences: In 1935 he left Makassar for Medan, North Sumatra, where he became the editor of an Islamic weekly magazine. It was during the period that he wrote "Di Bawah Lindungan Ka'bah", his first novel.