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What are the chemical elements that form most of the living biological matter?

The chemical elements that form most of the molecules of the living beings are oxygen (O), carbon (C), hydrogen (H) and nitrogen (N).

Living beings are made of organic and inorganic substances. According to the complexity of their molecules how can each of those substances be classified?

Inorganic substances, like water, mineral salts, molecular oxygen and carbon dioxide, are small molecules made of few atoms. Organic substances, in general, like glucose, fatty acids and proteins, are much more complex molecules made of sequence of carbons bound in carbon chains. The capacity of carbon to form chains is one of the main chemical facts that permitted the emergence of life on the planet.

What are the most important inorganic molecular substances for the living beings?

The most important inorganic substances for the living beings are water, mineral salts, carbon dioxide and molecular oxygen. (There are several other inorganic substances without which cells would die.)