Complex sentence: Edward Delavan Perry, Indra is the most referred to deity in the Rigveda, one celebrated for his powers, and the one who kills the great symbolic evil named Vritra who obstructs human prosperity and happiness.
Split into simpler sentences: Edward Delavan Perry, Indra is the most referred to deity in the "Rigveda". He is celebrated for his powers, and the one who kills the great symbolic evil named Vritra who obstructs human prosperity and happiness.