What is the version of the following sentence with correct punctuation?

It was a young Mr Reginald Leeper who three decades later as Sir Reginald became British Ambassador in Argentina I then looked to Whos Who for information about Mr Leepers career and found that his first recorded employment began when he was twentynine in 1917 entered International Bureau Department of Information in 1917 Mr Leepers memorandum about Mr Wilton was sent to The Times early in May 1917
It was a young Mr. Reginald Leeper, who three decades later (as Sir Reginald) became British Ambassador in Argentina. I then looked to Who's Who for information about Mr. Leeper's career and found that his first recorded employment began (when he was twenty-nine) in 1917: "entered International Bureau, Department of Information in 1917." Mr. Leeper's memorandum about Mr. Wilton was sent to The Times early in May 1917.