A thesis shows The focus of writers analysis
The position of the writing prompt
The evidence that will be used
The writers style and language

The focus of writers analysis

Explanation:

The thesis sentence shows the reader what the article or journal is all about. It is referred to as an essay's main assertion.

The thesis should tell the readers the main point that is contained in the paper. A good thesis should be purposeful, specific, and narrow.

The thesis should be the focus of writers analysis.

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.

sentence lenght varies according to word choice.you select which word to use and that will require to use other expressions that collocate with the word chosen.sentence length will vary   according to the choice of words you make to express your ideas.