Add punctuation: These vacuum cleaners are generally not equipped with a hose have a small amount of dust lowpower engine and powered by a rechargeable battery
A: These vacuum cleaners are generally not equipped with a hose, have a small amount of dust, low-power engine and powered by a rechargeable battery.

Add punctuation: Moreorless obsolete subjectscanning feature
A: More-or-less obsolete subject-scanning feature

Add punctuation: He said that academician V N Vinogradov should be put in chains and that another one of the alleged plotters should be beaten
A:
He said that academician [V. N. ] Vinogradov should be put in chains, and that another one [of the alleged plotters] should be beaten.