Complex sentence: This unsustainable situation collapsed in 1971, when Germany was the first to officially abandon the Bretton Woods accords, resulting in a sudden decline of the dollar, and igniting the onset of a gold bull market culminating in a price peak of US $850 in 1980.
Split into simpler sentences: This unsustainable situation collapsed in 1971, when Germany was the first to officially abandon the Bretton Woods accords, resulting in a sudden decline of the dollar. The events of 1971 ignited the onset of a gold bull market culminating in a price peak of US $850 in 1980.