Complex sentence: He advised Sisulu to request weaponry from the People's Republic of China, which was denied; though the Chinese government supported the anti-apartheid struggle, they believed the movement insufficiently prepared for guerilla warfare.
Split into simpler sentences: He advised Sisulu to request weaponry from the People's Republic of China, which was denied. Although the Chinese government supported the anti-apartheid struggle, they believed the movement insufficiently prepared for guerilla warfare.