Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: Best before is usually advisory and refers to the quality of the product, in contrast with Use by and Best by which indicate that the product is no longer safe to consume after the specified date.

"Best before" refers to the quality of the product. "Use by" and "Best by"  refers to the date that the product is no longer safe to eat.