there is a theme in every sentence.
constructing an english sentence depends on choice of words to express the theme, which you must not distract from. leave that for further sentences or paragraphs.
choosing the right words is important. you need a vocabulary list....
words that describe the theme or suggest the theme in a different light.
for example the theme is work. it may be clerical, that is, writing itself. the writer ended the sentence and killed off the paragraph with the word then.