Sitting on the tower, he gazed at the scenery( change into compound)

He sat on the tower and gazed at the scenery

Reason: a compound sentence is when two sentences are brought together.

As the boys sleep, military airplanes battle fiercely above the island. none of the boys sees the explosions and flashes in the clouds because the twins sam and eric, who were supposed to watch the signal fire, have fallen asleep. during the battle, a parachutist drifts down from the sky onto the island, dead.