concise
Saying something clearly in as few words as needed, without losing meaning.
redundancy
Saying the same thing twice: past history, free gift, completely finished.
wordiness
Using more words than needed: due to the fact that instead of because.
nominalization
A verb turned into a noun, often making a sentence wordy: make a decision instead of decide.
comma splice
Two independent clauses joined with only a comma: It was late, we went home.
run-on sentence
Two or more independent clauses joined with no punctuation or joining word.