Complex sentence: By the end of 1992, it controlled about 70% of Bosnia and Herzegovina, following a large-scale campaign of territorial conquest and ethnic cleansing backed by military and financial support from the Federal Republic of Yugoslavia.
Split into simpler sentences: By the end of 1992, it controlled about 70% of Bosnia and Herzegovina. This was achieved through a large-scale campaign of territorial conquest and ethnic cleansing which was backed by military and financial support from the Federal Republic of Yugoslavia.