In this task, given a sentence in the English language, your task is to convert it into English Tokens.

Example Input: Seen in the photograph below is Lieutenant (Navy) Armstrong, the Executive Officer of RCSCC 18 Vanguard, in the background, are Vanguard cadets.
Example Output: Seen in the photograph below is Lieutenant -LRB- Navy -RRB- Armstrong , the Executive Officer of RCSCC 18 Vanguard , in the background , are Vanguard cadets .

Example Input: After his final Eurovision appearance he left the music industry and became a building contractor.
Example Output: After his final Eurovision appearance he left the music industry and became a building contractor .

Example Input: At its center, the depth of the earthquake had been measured at ten kilometers (6.2 miles).
Example Output:
At its center , the depth of the earthquake had been measured at ten kilometers -LRB- 6.2 miles -RRB- .