You will be given a definition of a task first, then some input of the task.
In this task, given a sentence in the English language, your task is to convert it into English Tokens.

Britain's state-owned national railway company British Rail was controversially split-up and privatized in stages between 1993 and 1997.
Output:
Britain 's state-owned national railway company British Rail was controversially split-up and privatized in stages between 1993 and 1997 .