Simplify the following text for a Grade 9 native English-speaking person.
Original: A very high lahar risk was stressed in the mission 's report delivered on October 22 , 1985 and various simple preparedness techniques were proposed to local authorities .
Simplified: The mission 's report , delivered on October 22 , 1985 , judged the risk of lahars to be very high . The report proposed various simple preparedness techniques to local authorities .