How should this sentence be changed?
I think we should do something about the overgrown playground on Third Street it presents a danger to the community.

Question 8 options:

a)
Add a semicolon after the word Street

b)
Add a comma after the word Street

c)
No change needs to be made to this sentence

d)
Add a comma after something

faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form.

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

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

the problem is the last sentence, the first two have 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 all three sentences:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.