Complex sentence: Tantalum capacitors possess very low electrical leakage, (high leakage resistance), and will retain a charge for a long duration, they are also more tolerant of harsh, hot operating environments unlike standard aluminium electrolytic capacitors.
Split into simpler sentences: Tantalum capacitors possess very low electrical leakage (high leakage resistance), and will retain a charge for a long duration. They are also more tolerant of hot operating environments, unlike standard aluminium electrolytic capacitors.