In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.

Example Input: historically , the sensations of itch and pain have not been considered to be independent of each other until recently , where it was found that itch has several features in common with pain , but exhibits notable differences.
Example Output: the sensations of itch and pain have never been considered to be independent of each other until recently where it was found that itch has many features in common with pain but exhibits differences.

Example Input: the battle began a seven-year war which established the rhine as the boundary of the roman empire for the next four hundred years , until the decline of the roman influence in the west.
Example Output: the battle continued for seven years and as a result the rhine became the boundary of the roman empire for the next four hundred years . it persisted so until the downfall of the roman control in the west.

Example Input: ensuring that the food supply is free of contamination.
Example Output:
this ensures that the food supply is free of contamination.