Complex sentence: The heart is also the main source in forming the other organs using the heat from the heart the body is able to create the main source of nourishment which is the start of the formation of the liver which holds the source of nourishment within it.
Split into simpler sentences: The heart is also the main source in forming the other organs; using the heat from the heart, the body is able to create the main source of nourishment. This marks the start of the formation of the liver, which holds the source of nourishment within it.