Add spaces: group,surprise,foursome,Spanish

Answer: group, surprise, foursome, Spanish

Add spaces: Thismeritedaninvestigationbuteventuallynothingcameofit.

Answer: This merited an investigation but eventually nothing came of it.

Add spaces: Inadditiontothis,thereistheenvironmentalbenefitofreplacingtheburningofoilwithenergyproductionbasedonnature'sownpower.

Answer:
In addition to this, there is the environmental benefit of replacing the burning of oil with energy production based on nature's own power.