Complex sentence: Donald Franciszek Tusk (born 22 April 1957) is a former Prime Minister of Poland from 2007 to 2014 and a co-founder and chairman of the Civic Platform ("Platforma Obywatelska") party.
Split into simpler sentences: Donald Franciszek Tusk (born 22 April 1957) was Prime Minister of Poland from 2007 to 2014. He was a co-founder and is chairman of the Civic Platform ("Platforma Obywatelska") party.