TASK DEFINITION: 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.
PROBLEM: 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.

SOLUTION: 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.

PROBLEM: on december 19 , 2006 , a large white plume of condensing steam was observed , leading some media people to assume there had been a small eruption.

SOLUTION: on december 19 , 2006 , a large white & dense plume of steam led some media people to take it as a small eruption.

PROBLEM: castlevania iii : dracula 's curse is the third game in the series ' canon , featuring simon belmont 's ancestor , trevor belmont.

SOLUTION:
castlevania iii : dracula 's curse is the third game in the series , featuring trevor belmont , simon belmont 's ancestor.