Complex sentence: In June 1906, Wong Nai Siong met Sun Yat Sen in Singapore and joined the Chinese Revolutionary Alliance and started promoting the revolutionary propaganda in China and was involved in the planning of the Chaozhou Huanggang Uprising and the Promoting of FuZhou's education and industrialization.
Split into simpler sentences: In June 1906, Wong Nai Siong met Sun Yat Sen in Singapore and joined the Chinese Revolutionary Alliance. He started disseminating revolutionary propaganda in China, and was involved in the planning of the Chaozhou Huanggang Uprising and the promoting of FuZhou's education and industrialization.