Simplify the following text for a Grade 4 native English-speaking person.
Original: The effects of El NiÃ o in South America are direct and stronger than in North America . An El NiÃ o is associated with warm and very wet weather months Aprilâ `` October along the coasts of northern Peru and Ecuador , causing major flooding whenever the event is strong or extreme .
Simplified: Every three to seven years , an El NiÃ o event may last for many months .