Instructions: In this task, given a sentence in the English language, your task is to convert it into English Tokens.
Input: Two counts of this stem from the crash of a helicopter that was fighting the fires, and the other from a separate incident when a third firefighter was seriously wounded while battling the flames.
Output:
Two counts of this stem from the crash of a helicopter that was fighting the fires , and the other from a separate incident when a third firefighter was seriously wounded while battling the flames .