Simplify the following text for a Grade 4 native English-speaking person.
Original: The typhoon produced heavy rainfall early in its lifetime while passing near Guam , including a total of 23.1 cm ( 9.09 in ) at Andersen Air Force Base .
Simplified: The typhoon produced heavy rain while passing near Guam , including a total of 23.1 cm ( 9.09 in ) an Air Force base .