Compound-Complex Sentence
The useful task is identifying clause independence and then punctuating the relationships clearly. A long sentence with only one independent clause is still not compound-complex, while a relatively short sentence can be.
A compound-complex sentence contains at least two independent clauses and at least one dependent clause. Sentence length alone does not make a sentence compound-complex; the diagnosis depends on clause structure.
Key details
Further guidance
Contrast
A compound sentence has multiple independent clauses without the required dependent clause; a complex sentence has a dependent clause but only one independent clause.
Diagnostic
Mark each finite clause, then determine which can stand independently and which depends on another clause.
Punctuation
Punctuate independent-clause coordination and dependent-clause placement according to their actual relationships, not merely by counting clauses.
Worked Example
“Although the draft was late, Maya finished the tables, and Leo checked the references.” has one dependent clause and two independent clauses.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Sentence Structure, Variety, and Clarity (opens in a new tab)Purdue Online Writing Lab · Defines compound-complex structure as at least two independent clauses plus at least one dependent clause.
- Sentence Types: Transcript (opens in a new tab)Purdue Online Writing Lab · Explains simple, compound, complex and compound-complex sentence structures in clause terms and writing context.