Simplify the following text for a Grade 9 native English-speaking person.
Original: On November 13 , 1985 , at 9:08 pm , Nevado del Ruiz erupted ; ejecting dacitic tephra more than 30 kilometers into the atmosphere .
Simplified: At 9:09 pm , on November 13 , 1985 , Nevado del Ruiz erupted , ejecting dacitic tephra more than 30 k into the atmosphere .