Complex is just a group of Simples

Lines and curves compose a letter...
letters compose a word...
Words compose a paragraph...
Paragraph compose an article...
Articles compose a book...
Books compose a library...

Simple things always compose complex things. Ever complex things is just composed of multiple of simples. Therefore, if you encounter something complicated, just go to its simple parts bit by bit, and you will never notice its complexities until you learn everything.