A/an answer is a punctuation mark used to show an important connection between words or parts of words.

Hyphen

The hyphen is a punctuation mark used to show the important connection between words or parts of words.  The hyphen is used to indicate compound adjectives placed before nouns such as “well-rounded individual.”  The hyphen is used to indicate fractions such as “three-fifths.”  The hyphen is used to indicate certain numbers as in “forty-two.” The hyphen is used with all “self” words such as “self-confident.”  And, the hyphen is used to break words at syllables if appearing at the end of a line on a page such as how a hyphen would be placed between the two “g’s” of “bigger” if bigger were to end a line and it needed to be split for the sake of space on a page.

faulty parallelism is a grammar construction where there is no balance in the parts of a sentence they have a similar meaning but the grammar structure is not equivalent.

the correct version of this faulty parallelism in the sentence is:

jefferson wrote the declaration of independence, and he was the nation's third president.

the problem with the first version is that the sentence:

"jefferson was both the writer of the declaration of independence"

presents jefferson as both a subject and an agent for the verb "write" because if he was "the writer" then the declaration of independence was written by him, besides that fact, the sentence presents a dependent clause.

while the second sentence:

he was the nation's third president.

presents a basic subject+verb+object structure

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in both sentences:

jefferson wrote the declaration of independence, and he was the nation third president.