Add spaces: Onceuponatime...Agenuineadventurebeginsofcoursewith'Onceuponatime'.

Answer: Once upon a time ... A genuine adventure begins of course with 'Once upon a time'.

Add spaces: unusedinoriginalbox.Variousmakers.

Answer: unused in original box. Various makers.

Add spaces: Mantinis1234,UnitedKingdomIamaman,20yearsold,seekingawomanagefrom20till30

Answer:
Mantinis1234 , United Kingdom I am a man, 20 years old, seeking a woman age from 20 till 30