Add spaces: 1947:ResearchersatBellLaboratories,theresearchbranchofAT&T,developedtheconceptofthecellulartelephone.

Answer: 1947: Researchers at Bell Laboratories, the research branch of AT&T, developed the concept of the cellular telephone.

Add spaces: Luminousapartmentforupto7peoplewithairconditioningnexttoParalelo

Answer: Luminous apartment for up to 7 people with air conditioning next to Paralelo

Add spaces: Groundflyingtrainersandpartsthereof

Answer:
Ground flying trainers and parts thereof