Original sentence: As soon as sentient beings felt willpower, Ion was born, from the green of the emotional spectrum.Its existence has been kept a secret for eons, and resided in the Central Battery on Oa to keep Parallax, the parasitic fear entity imprisoned in the Central Battery, in check, as well as granting the Guardians of the Universe, Manhunters, The Green Glob, Halla's, and then The Green Lantern Corps portions of its vast powers
Edited sentence: As soon as sentient beings developed willpower, Ion was born, from the green wavelength of the so-called "emotional spectrum".Its existence has been kept a secret for eons, and he resided in the Central Battery on Oa to keep Parallax, the parasitic fear entity also imprisoned there, in check, as well as granting the Guardians of the Universe, Manhunters, The Green Glob, Halla's, and then The Green Lantern Corps a portion of its vast powers