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: it was originally thought that the debris thrown up by the collision filled in the smaller craters.
Example Output: originally , it was thought that smaller craters were filled in with debris from the collision.

Example Input: diagnosis is made by seeing these symptoms , having a history of exposure is also helpful but not always found as kennel cough is easily spread through contact with contaminated surfaces such as the ground , toys , sidewalks , dog parks.
Example Output: diagnosis is made by seeing these symptoms , having a history of exposure is also helpful , but not always found as kennel cough is easily spread through contact with contaminated surfaces such as the ground , toys , sidewalks , dog parks.

Example Input: therefore , these pdfs can not be distributed without further manipulation if they contain images.
Example Output:
if the pdfs contain pictures , they can not be shared unless they are changed.