Simplify the following text for a Grade 4 native English-speaking person.
Original: In popular tradition , the invention and naming of the condom came to be attributed to an associate of England 's King Charles II , one `` Dr. Condom '' or `` Earl of Condom '' .
Simplified: It is important to know how to use a condom before using one . If a mistake is made , the condom may not work .