Complex sentence: For nine months, Doundoulakis was the only American soldier in Salonica where over 85,000 German troops were stationed., sending four hundred messages which resulted in the sinking of many Axis ships and the disruption of railway lines.
Split into simpler sentences: For nine months, Doundoulakis was the only American soldier in the city where over 85,000 German troops were stationed. He sent four hundred messages, which resulted in the sinking of many Axis ships and the disruption of railway lines.