Complex sentence: He was marched through the jungle, was tied spreadeagled on the ground to four stakes to stop him escaping at night and in the morning his face would be so swollen from mosquito bites he was unable to see.
Split into simpler sentences: He was marched through the jungle, was tied on the ground to four stakes spreadeagled in order to stop him escaping at night. In the morning his face would be swollen from mosquito bites and he was unable to see.