Complex sentence: He covered the last six months of the Kuomintang administration and the first six months of the Maoist People's Republic, often working in the company of the Shanghai-based photojournalist Sam Tata, whom Cartier-Bresson had previously befriended in Bombay.
Split into simpler sentences: He covered the last six months of the Kuomintang administration and the first six months of the Maoist People's Republic. In Shanghai, he often worked in the company of the photojournalist Sam Tata, whom Cartier-Bresson had previously befriended in Bombay.