If the structure of a sentence is needlessly indirect, try simplifying it. Look for opportunities to strengthen the verb.

The verb estimate is more vigorous and concise than make an estimate of.

The colorless verbs is, are, was, and were frequently generate excess words.

The revision is more direct and concise. The action (studying), originally appearing in a subordinate structure, has become a strong verb, studied.

The expletive constructions there is and there are (or there was and there were) can also lead to wordy sentences. The same is true of expletive constructions beginning with it.

Finally, verbs in the passive voice may be needlessly indirect. When the active voice expresses your meaning as effectively, use it. (See W3-a.)