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.

In respective singles matches, John Cena defeated Sabu in an Extreme lumberjack match, which featured superstars from the Raw and ECW brands at ringside.
John Cena beat Sabu in a lumberjack match which had superstars from Raw and ECW at ringside.

In each issue, there was a review of an artist's entire discography, with each album being analyzed in turn.
Each issues features an artist's works. Each album is scrutinized.

The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation.

The electromagnetic spectrum is the set of all potential electromagnetic radiation.

