Original sentence: Since the 1930s, increasingly Japan's expansionist policies brought her into conflict with her neighbors, Russia and China, including with Russian influence expansion into Manchuria and Korea (which Japan saw as a threat and which helped spark the Russo-Japanese War which, after a surprise attack on the Russian fleet, resulted in Japanese victory)
Edited sentence: Since the 1930s, increasingly Japan's expansionist policies brought her into conflict with her neighbors, Russia and China, including with Russian influence expansion into Manchuria and Korea (which Japan saw as a threat and which helped spark the Russo-Japanese War which resulted in Japanese victory)