Complex sentence: He rose to the post of Deputy Managing Director of Grant Advertising before his 30th birthday and co-founded Insight Communications (now Insight Grey) in 1979 and has today grown the company from the initial 18 man strong team into an advertising behemoth.
Split into simpler sentences: He rose to the post of Deputy Managing Director of Grant Advertising before his 30th birthday. He co-founded Insight Communications (now Insight Grey) in 1979 and has today grown the company from the initial 18 man strong team into an advertising behemoth.