Complex sentence: In 1980, IMS began publishing its newsletter entitled "Montessori Observer", and soon thereafter, the 8-page newspaper "Montessori News", which is oriented more to non-professionals.
Split into simpler sentences: In 1980, IMS began publishing its newsletter entitled Montessori Observer. Soon thereafter, it began publishing the 8-page newspaper Montessori News, which is oriented more to non-professionals.