Complex sentence: He is a member of the international secular hip hop activist movement, The Anti-Injustice Movement (aka AIM Clika), and runs with others, including the Grand Unified Theory organization, which uses creativity to educate people about science and rational thinking.
Split into simpler sentences: He is a member of the international secular hip hop activist movement and The Anti-Injustice Movement (aka AIM Clika). With others, he founded the Grand Unified Theory organization, which uses creativity to educate people about science and rational thinking.