Why All The Scientist Made Such Difficult Theories And Laws?

All these theories were made after very detailed observations by these scientists. These theories appear to be difficult for variety of reasons like:
When the theories of particular subject are told, which arn't in your area of interest,
When the theories arn't taught with proper details or when these theories arn't delivered properly.
Understanding these theories, sometimes, require the detailed experimentation in the labs, for which mostly school labs arn't prepared and students need to consume the theories just in words and thus find it difficult to understand.

We must say that these scientists were genius that they devicd laws and theories by doing research and on the other hand we are even unable understand them sometimes.
Basically the scientists have target of understanding a natural phnomenon, and in this regard they do work and explore. Actullly these laws are not made by them. Laws are preent in nature, scientists just explore them and use them for inventions.
As far as understanding these laws and theories are concerned nothing is impossible. Only thing required is to give them attention and interest. When we study them with devotion we will understand them INSHALlAH.