What does "vary your sentences" mean?

I will add to my blog later. I am hungry now. I have to make supper. I am writing boring sentences. I start each sentence the same. I have not varied my sentences. They are short. They have a subject and verb at the beginning. They sound robotic. It lulls you to sleep. You wish me to stop. I just keep going. If only I would write a nice subordinate clause like this one, then my blog entry would improve because readers like seeing and hearing variety in the text. To prove my point, I have not started the past two sentences with the same old subject and verb pattern. Variety, dear reader, is the spice in writing. Making your sentences interesting is an art form. But I digress. I wrote my blog post anyway. I am extra hungry now. I will go make supper. I will not write boring sentences. I will not write more boring sentences. I will ... munch munch munch ... not write with my mouth full.