because we as people are not complicated so something has to be
No one can really answer that question. It is unknown to man.
All natural languages are complex. Languages simply are as they are.
That's a rather nonsensical question; e.g. why is the world so complex? To be honest, the nitrogen cycle is not very complex, just requires some understanding. I recommend reviewing diagrams and...
it is there way to be complex so guys cant understand them, if we did it be weird