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.

Belgium covers an area of 30,528 km2 (11,787 square miles) and has a population of about 10.5 million.
Output:
Belgium covers an area of 30,528 km2 -LRB- 11,787 square miles -RRB- and has a population of about 10.5 million .