Complex sentence: The wild ancestors of this fish are native to the rice paddies of Thailand, Malaysia, Cambodia and Vietnam and are called "pla-kad" (lit. biting fish) in Thai or "trey krem" in Khmer.
Split into simpler sentences: The wild ancestors of this fish are native to the rice paddies of Thailand, Malaysia, Cambodia, and Vietnam. They are called "pla-kad" (lit. biting fish) in Thai or "trey krem" in Khmer.