Simplify the following text for a Grade 7 native English-speaking person.
Original: This period is often overlooked where there is an `` extended warranty '' in which a seller or manufacturer contracts to provide the additional service of replacing or repairing goods that fail within the extended period . However , if the goods were defective at the time of sale , and the relevant statute of limitations has not expired , then existence or duration of any `` extended warranty '' is secondary : there was a breach of a primary warranty for which the seller may be liable .
Simplified: Five years is an extended warranty .