Complex sentence: The dominating parties were the conservatives, the freeminded and the social democrats, the latter did become the single largest party in 1938 but due to a strong centre-right majority it remained in opposition.
Split into simpler sentences: The dominating parties were the conservatives, the freeminded and the social democrats. The latter did become the single largest party in 1938 but due to a strong centre-right majority it remained in opposition.