Sentences are pretty simple little things. Noun and predicate. So why do we screw them up with lame verbs? Good question.
Even in the complex sentence, we still depend upon the noun, we still depend upon the verb. So those constructions better rock.
And because the difference between a brilliant sentence and a bad sentence usually boils down to the verbs … your verbs need life.
They should vibrate. Tremble. They should carve a vivid picture in the head of your reader.
In other words, they should be active. And fierce. They should growl, hiss. Leave an aroma.