Why are so many words not pronounced how they are spelled?

Doesnt it just needlessly complicate things for no real reason? 

Elaine M2021-03-02T16:24:10Z

Because English borrows from over 5 different languages. 

yet-knish!2021-03-02T04:49:00Z

The language has evolved over a long period of time, and the way it is now is just how it's worked out.  It wasn't planned that way.