So no one gets hurt in case of an emegancy
The best structured sentence that best uses the comma is the second sentence being: The female statue, crowned with a wreath of olive leaves, represents commerce. The sentence talks about a statue that is crowned with leaves and symbolizes business. The second sentence perfectly captures that.
Jack crouched, staring forward, with his face only a few inches away.
The two boys had jogged down the beach and turned from the water's edge, back towards the pink mountain. Ralph frowned as a trickle of smoke floated in a line across the sky.
Hunters were shouting from beyond the platform, on the end, was Piggy. He was lying down, staring down at the brilliant wanter.
Simon was always darkish in color when he was burned by the sun. It left a deep tan that glistened with sweat.
Simon paused and looked over his shoulder just as Jack had done. He glanced swiftly, just to confirm to himself that he was utterly alone.