Complex sentence: Biko was never a member of the African National Congress (ANC), but the ANC nonetheless included him in the pantheon of struggle heroes, going so far as to use his image in campaign posters in South Africa's first non-racial elections in 1994.
Split into simpler sentences: Biko was never a member of the African National Congress (ANC). But the ANC considered him an anti-apartheid hero and used his image in campaign posters in South Africa's first non-racial elections in 1994.