Using simple sentences most of the time. Having shorter and longer sentences.
Mixing in different types of sentences.
Using fragments more often.
Utilizing different sentence structures.

Select all that are true of simple sentences:
Are short in length
Contains one or more subject and verb sets
Contain one or more subordinate clauses
May contain phrases
Contain one independent clause
Are long in length
Contain two or more independent clauses
Require coordinating conjunctions
Require subordinating conjunctions or relative pronouns

Select all that are true of complex sentences:
Are short in length
Contains one or more subject and verb sets
Contain one or more subordinate clauses
May contain phrases
Contain one independent clause
Are long in length
Contain two or more independent clauses
Require coordinating conjunctions
Require subordinating conjunctions or relative pronouns

Select all that are true of compound sentences:
Are short in length
Contains one or more subject and verb sets
Contain one or more subordinate clauses
May contain phrases
Contain one independent clause
Are long in length
Contain two or more independent clauses
Require coordinating conjunctions
Require subordinating conjunctions or relative pronouns

Select all that are true of compound-complex sentences:
Are short in length
Contains one or more subject and verb sets
Contain one or more subordinate clauses
May contain phrases
Contain one independent clause
Are long in length
Contain two or more independent clauses
Require coordinating conjunctions
Require subordinating conjunctions or relative pronouns