Many writers find that they have needless repetion in their writing and some don't realize it all. These take shape in forms of "deadwood writing", or phrases/sentences that repeat or continue a theme that was easily understood. Expounding is one thing, but only if it is necessary. Wordy phrases often distract the reader and lose their way in the story. When the story picks back up again, they've forgotten what was going on.
Examples of "deadwood phrases" and their "fixes" are as follows:
"I came to the realization that" to "I realized that"
"Concerning the matter of" to "She/He thinks that"
For the period of a year" to "For a year"
"At that point in time" to "Then"
Needless repetition phrases:
"She was in a depressed state of mind" to "She was depressed."
"He has no emotional feelings" to "He has no feelings"
"Each and every person should come" to "Everyone should come"
"round in shape" to "round"
"tall in stature" to "tall"
"blue in color" to "blue"
"very unique" to "unique"
"the reason why is because" to "the reason is that"
Using large words with fancy meanings also detracts from the writing when simple works just as well, gets the point across more simply and without the reader rushing off to find a dictionary. While using an occasional "big word" is good, liberally lacing your writing with them would definitely be a no-no.