Complex sentence: Potentially the first hominid to engage in hunting, "H. erectus" mastered the art of making fire and was the first to leave Africa, going on to colonize the entire Old World and perhaps later on giving rise to "Homo floresiensis".
Split into simpler sentences: Potentially the first hominid to engage in hunting, "H. erectus" mastered the art of making fire. They were the first hominids to leave Africa, going on to colonize the entire Old World, and perhaps later on giving rise to "Homo floresiensis".