Complex sentence: David Ben-Gurion, the first Prime Minister of Israel was very committed to the use of the Hebrew language (he changed his surname from Gryn to Ben Gurion) tried to convince as many people to change their surnames into'real' Hebrew ones.
Split into simpler sentences: David Ben-Gurion, the first Prime Minister of Israel was committed to the use of the Hebrew language (he changed his surname from Grün to Ben-Gurion). He tried to convince as many people to change their surnames into'real' Hebrew ones.