Complex sentence: The purpose of the shock position is to elevate the legs above the heart in a manner that will slightly help blood flow to the heart, hopefully helping more blood become oxygenated and helping some with the hypoxia that causes shock.
Split into simpler sentences: The purpose of the shock position is to elevate the legs above the heart in a manner that will slightly help blood flow to the heart. Hopefully helping more blood become oxygenated and helping some with the hypoxia that causes shock.