Complex sentence: By the end of 2007, the company had driven their revenues up to $105.3 million by diversifying from emergency response services to well intervention services, which now comprise the majority of the revenue they generate.
Split into simpler sentences: By the end of 2007, the company had driven their revenues up to $105.3 million by diversifying from emergency response services to well intervention services. Well intervention services now comprise the majority of the revenue they generate.