Complex sentence: In 1951 Matas decided to rebel against the "Apotekermonopolet" (English: "The Drugstore Monopoly"), which was a law dating back to 1929, deciding that only pharmacies could sell any form of drugs or vitamin supplements.
Split into simpler sentences: In 1951 Matas decided to rebel against the "Apotekermonopolet" (English: "The Drugstore Monopoly") which was a law dating back to 1929. This law said that only pharmacies could sell any form of drugs or vitamin supplements.