Complex sentence: Under these circumstances, glutamate dehydrogenase activity is raised in order to increase the amount of α-Ketoglutarate produced, which can be used to provide energy by being used in the citric acid cycle to ultimately produce ATP.
Split into simpler sentences: Under these circumstances glutamate dehydrogenase activity is raised to increase the amount of α-Ketoglutarate that is produced. The product α-Ketoglutarate can be used to provide energy by being used in the citric acid cycle to ultimately produce ATP.