Add spaces: Oneofthosealiensarethetruerulersofearthforhundredsofthousandsofyears.

Answer: One of those aliens are the true rulers of earth for hundreds of thousands of years.

Add spaces: 4.10TelephonerequeststotheServiceCentreoftheprovider

Answer: 4.10Telephone requests to the Service Centre of the provider

Add spaces: TheFluke325True-rmClampMeteroffersbigfeaturesinasmallformfactor.

Answer:
The Fluke 325 True-rm Clamp Meter offers big features in a small form factor.