Complex sentence: He did Advanced Level and went to Harare to seek for employment which he eventually secured in 2004, where he worked at Quetech Holdings until 2005 when he left to join the Airport Authority where he is currently attached.
Split into simpler sentences: He did Advanced Level and went to Harare to seek for employment which he eventually secured in 2004, where he worked at Quetech Holdings until 2005. He left to join the Airport Authority where he is currently attached.