Input (grade 9): At 9:09 pm, on November 13, 1985, Nevado del Ruiz erupted, ejecting dacitic tephra more than 30 k into the atmosphere.
Output (grade 10): On November 13, 1985, at 9:08 pm, Nevado del Ruiz erupted; ejecting dacitic tephra more than 30 kilometers into the atmosphere.