Revelle Humanities Grammar Handbook
6 Sentence fragments
7 Run-on sentences
8 Verb agreement
13 Passive voice
15 ESL
17 Misplaced modifiers
18 Pronoun reference
20a Comparisons
21 Parallel construction
23 Commas
23d Sexist language
25/6 Semicolons & colons
29 Ellipsis
31 Brackets
35 Apostrophes
36 Abbreviations
37 Underlining
39 Numbers
41b Slang
41e Jargon
41f Pretentious language
42c Idioms
42e Clichés
43a Fluff

6 Sentence fragments
The basic rule is, a complete sentence contains both a subject and a predicate. See also the following advice on avoiding sentence fragments.

Fragment: The Odyssey portrays a powerful struggle between the forces of culture and the forces of nature. Which makes this epic adventure also a story of the advance of civilization.

Revised: The Odyssey portrays a powerful struggle between the forces of culture and the forces of nature, which makes this epic adventure also a story of the advance of civilization.

-- or --

The Odyssey portrays a powerful struggle between the forces of culture and the forces of nature. This makes this epic adventure also a story of the advance of civilization.