How could you change a complex sentence into a simple sentence in English ?

By rephrasing the words, using simple english to translate the complex words.

Example: The ravenous throng scampered toward the delectable viands, which was impeccably arrayed on the table.

Simple english: The extremely hungry crowd ran toward the delicious food, which was extremely well organized (into rows) on the table.

You can use a thesaurus, a dictionary or even a word document to search for synonyms and definitions within the document...