Complex sentence: In 2003 the company started expanding and has, through series of acquisitions, built on the foundation of some of the most well known and respected picture agencies in Sweden with a history dating back more than 60 years.
Split into simpler sentences: In 2003 the company started expanding and has, through series of acquisitions, strengthen its foundation with some of the most well known and respected picture agencies in Sweden. Companies with a history dating back more than 60 years.