The great hall is open to the public, you must reserve a spot in advance. how is the comma used incorrectly in the sentence above? the comma attempts to separate a compound predicate. the comma attempts to join two independent clauses. the comma attempts to set apart an essential element. the comma attempts to separate a compound subject.

The comma attempts to join two independent clauses.

These two sentences are independent clauses. We know this because they both have a subject and a predicate (including a verb). These sentences would work better if they were separated by a period. Alternatively, they could also be joined by a semicolon.

cabeza de vaca was an spanish explorer and n his long exploration of 11,000.km. from florida to present-day mexico, he went through a series of calamities and setbacks that only added to his deeds. he applied his religious creed with the humanist idea, always current and universal, that all men were equal before god and destiny without any discrimination. as an explorer, he became a slave to the tipinoga, then his shaman pointer, later and after an operation of heart to an indian (from which both came alive) he achieved stardom and became a hero followed by a crowd that professed unusual respect and admiration.