Complex sentence: Masood was reported to have been an English teacher or tutor in Saudi Arabia sometime between 2005 to 2009, when he returned to the United Kingdom and worked at a TEFL college in Luton.
Split into simpler sentences: Masood was reported to have been an English teacher or tutor in Saudi Arabia sometime between 2005 to 2009. After which he returned to the United Kingdom and worked at a TEFL college in Luton.