If an authorized patent contains three essential technologies: A, B and C, can I split it into several small technologies to apply for a patent?

Is your necessary technology a necessary technical feature? Or is it something else? If you are abc three skills. Their relevance is not strong, so they can be separated and applied separately. But maybe the patent you authorized in advance is the existing technology, which can affect your novelty or creativity.

It can be disassembled, but you need to be careful when writing, so as not to affect your novelty and creativity.