Complex sentence: Fontana Records is a record label which was started in the 1950s as a subsidiary of the Dutch Philips Records; when Philips restructured its music operations it dropped Fontana in favor of Vertigo Records.
Split into simpler sentences: Fontana Records is a record label which was started in the 1950s as a subsidiary of the Dutch Philips Records. Fontana started in the 1950s as a subsidiary of the Dutch Philips Records; when Philips restructured its music operations it dropped Fontana in favor of Vertigo Records.