Complex sentence: On route back to China for a visit, Zhang met the anti-Manchu revolutionary, Sun Yat-sen and promised him extensive financial support, and on his return to Paris in 1907, led Li and Wu to join Sun's Tongmenghui (Chinese Revolutionary Alliance).
Split into simpler sentences: On route back to China for a visit, Zhang met the anti-Manchu revolutionary, Sun Yat-sen and promised him extensive financial support. On his return to Paris in 1907, Zhang led Li and Wu to join Sun's Tongmenghui (Chinese Revolutionary Alliance).