Complex sentence: He worked at the "Kyōto Newspaper" and the "Ōsaka Asahi Newspaper" and continued to contribute haiku to the magazine "Hototogisu" even while he worked.
Split into simpler sentences: He worked at the "Kyōto Newspaper" and the "Ōsaka Asahi Newspaper". He continued to contribute haiku to the magazine "Hototogisu" even while he worked.