How can this sentence be revised to formal style? If people are unable to look away from their smart phones and communicate with the world around them, then it will be in the end 0f civilization as we know it

If people do not look away from their smart phones and communicate with world then civilization will end.

Explanation:

The formal style of writing is unambiguous, precise and well structured. The formal style of writing presents the information without any doubt. It is difficult to write formal style sentences as the data needs to be correct and reliable.

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.