Complex sentence: Z releases 80 times the world's electrical power usage for a few trillionths of a second; however, only a small amount of electricity is consumed for each test (equal to the usage of 100 houses for two minutes).
Split into simpler sentences: Z releases 80 times the world's electrical power usage for a few trillionths of a second. However, only a small amount of electricity is consumed for each test (equal to the usage of 100 houses for two minutes).