Add spaces: Howdothesetoolscomparetootherbrands'highperformanceoscillatingtools?

Answer: How do these tools compare to other brands' high performance oscillating tools?

Add spaces: Onemayaddparentheticallythathewasoccasionallyinterestedhimselfinthisaspectofappliedprobability.

Answer: One may add parenthetically that he was occasionally interested himself in this aspect of applied probability.

Add spaces: Theremoteallowsyourconductortonavigatethetrainforwardsandbackwards,andturnonthesteamwhistlewhenevertheywantto.

Answer:
The remote allows your conductor to navigate the train forwards and backwards , and turn on the steam whistle whenever they want to .