Original sentence: Argentina has long disputed this claim, having been in control of the islands for a few years prior to 1833.The British claim to sovereignty dates from 1690, and the United Kingdom has exercised de facto sovereignty over the archipelago almost continuously since 1833
Edited sentence: Argentina has long disputed this claim, having for itself been in control of the islands at and prior to 1833 for several periods, and additionally with an earlier rule together with Spain from 1767-1811.The British claim to sovereignty dates from 1690, and the United Kingdom has exercised de facto sovereignty over the archipelago almost continuously since invading in 1833