By Norihiko Shirouzu, Maki Shiraki and David Dolan BEIJING/TOKYO (Reuters) – Nissan Motor Co’s concerns about technology transfers have complicated its partner Renault’s plans to sell a large stake in its gasoline-engine business to China’s Geely, three people familiar with the talks said. Renault is pursuing a complex two-pronged restructuring. On one hand, it is aiming to revamp its alliance with Nissan and convince the Japanese automaker to invest in a new electric car unit called Ampere. At the same time, it also plans to separate out its gasoline-car business, code-named “Horse”, and is s…