Complex sentence: When Lu Kang was alive, Yang Hu did not dare to attack Wu, and immediately after Lu Kang's death, Yang Hu began a series of petitions to the government for an invasion of Wu.
Split into simpler sentences: When Lu Kang was alive, Yang Hu did not dare to attack Wu. Immediately after Lu Kang's death, Yang Hu began a series of petitions to the government for an invasion of Wu.