Add punctuation: The presentday epigones that is the thoroughly bad disciples of Lenin like to cover up their shortcomings on every occasion that offers itself with quotations often entirely irrelevant
A: The present-day epigones, that is, the thoroughly bad disciples of Lenin, like to cover up their shortcomings on every occasion that offers itself with quotations often entirely irrelevant.

Add punctuation: The problem is that you may not fully realise that it is you yourself who are changing You may blame your unhappiness on a loved one who seems to be moving away from you or seeking affection elsewhere
A: The problem is that you may not fully realise that it is you yourself who are changing. You may blame your unhappiness on a loved one who seems to be moving away from you or seeking affection elsewhere.

Add punctuation: The vinyl roof is also new
A:
The vinyl roof is also new.