The first sentence is correct, while the second contains a comma splice. The second sentence can be corrected by using a semicolon to join the independent clauses properly.
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To correctly identify and fix the sentences provided:
King Henry VIII, who ruled England from 1509 to 1547, accomplished a number of important things.
This sentence is correct as it stands. It includes a subject ('King Henry VIII'), who he was ('who ruled England from 1509 to 1547'), and his actions ('accomplished a number of important things').
He separated the Church of England from Roman Catholicism, this act significantly altered his country's history.
This sentence has a comma splice problem. A comma splice occurs when two independent clauses are joined with just a comma.
To fix this, you can: a. Split into two separate sentences:
"He separated the Church of England from Roman Catholicism. This act significantly altered his country's history." b. Use a semicolon to join the clauses:
"He separated the Church of England from Roman Catholicism; this act significantly altered his country's history." c. Use a coordinating conjunction:
"He separated the Church of England from Roman Catholicism, and this act significantly altered his country's history."
These revisions ensure each sentence is complete and correctly punctuated.