Complex sentence: It was formerly abundant in small streams, but its habitat has been overrun by people and pollution, and it was listed in the 1996 IUCN Red List as "Vulnerable", and there is a real risk that it could become extinct in the wild.
Split into simpler sentences: It was formerly abundant in small streams, but its habitat has been overrun by people and pollution. This species was listed in the 1996 IUCN Red List as "Vulnerable", and there is a real risk that it could become extinct in the wild.