Complex sentence: The paper's politics rapidly hardened particularly following the end of the Algerian war; it became less devoted to show-biz news, and turned into a political newspaper regarded as right-wing but supporting no particular party.
Split into simpler sentences: The paper's politics rapidly hardened, particularly following the end of the Algerian War. It became less and less devoted to show-biz news, and became a political newspaper regarded as right-wing but supporting no particular party.