Simplify the following text for a Grade 8 native English-speaking person.
Original: Local geology suggests that a volcanic eruption on Flores approximately 12,000 years ago was responsible for the demise of H. floresiensis , along with other local fauna , including the elephant Stegodon .
Simplified: Local geology suggests that a volcanic eruption on Flores approximately 12,000 years ago was responsible for the end of H. floresiensis and animals that lived on the island . The elephant Stegodon also became extinct at this time .