What is the difference between the structure of simple and complex carbohydrates?

Simple carbs break down easier and contain sugars. Complex carbs contain starch and fiber.

Explanation:

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Simple vs Complex Carbs. Carbohydrates are sugars that come in 2 main forms – simple and complex. This is also referred to as simple sugars and starches. The difference between a simple and complex carb is in how quickly it is digested and absorbed – as well as it's chemical structure.

If the rocks and sand are mixed you can do the following:
~(its this object it has holes) put the sand on the strainer
the sand will fall right through
~On top of the strainer you will have the rocks 
TA~DA they are separated :)