Complex sentence: Melsbach was a firm contract partner of the regional famos punice-mining corporation Kann-Werke until the late 1980ies, when the punice-fields ran out of containings.
Split into simpler sentences: Melsbach was an firm contract-partner of the regional famos punice-mining corporation Kann-Werke til the late 80ies. At this time the punice-fields ran out of containings.