Complex sentence: He held a conviction that "inclusivity, accountability and freedom of speech" were the fundamentals of democracy, and was driven by a belief in natural and human rights, pursuing not only racial equality but also promoting gay rights as part of the post-apartheid reforms.
Split into simpler sentences: He held a conviction that "inclusivity, accountability and freedom of speech" were the fundamentals of democracy, and was driven by a belief in natural and human rights. This belief drove him to not only pursue racial equality but also to promote gay rights as part of the post-apartheid reforms.