Complex sentence: Two years later, most of the original members of the units had been killed and replaced so the loudspeaker talked about the wastefulness of Japan's military leaders, and their needless sacrifice of the nation's soldiers.
Split into simpler sentences: Two years later, most of the original members of the units had been killed and replaced. The loudspeaker talked about the wastefulness of Japan's military leaders, and their needless sacrifice of the nation's soldiers.