Complex sentence: In the 1980s, the DFLP was heavily financed by the USSR and China; however, the collapse of the Soviet Union and the growing Islamist trend in Palestinian society during the 1990s sapped the party of much of its popularity and resources.
Split into simpler sentences: In the 1980s, the DFLP was heavily financed by the USSR and China. However, the collapse of the Soviet Union and the growing Islamist trend in Palestinian society during the 1990s sapped the party of much of its popularity and resources.