Complex sentence: His father, Louis-Oscar Frossardan, was one of the founders of the French Communist Party, and served as the first Secretary-General of the French Communist Party, later holding a series of ministerial positions in the Government of the Popular Front.
Split into simpler sentences: His father, Louis-Oscar Frossardan, was one of the founders of the French Communist Party and served as its first Secretary-General. Later he held a series of ministerial positions in the Government of the Popular Front.