Add spaces: Speciallicenseswereneededforvariousoperations,sothattheremainingonesfounditverydifficulttooperate.

Answer: Special licenses were needed for various operations, so that the remaining ones found it very difficult to operate.

Add spaces: CountedinacensusinDalum,Odense,Denmark

Answer: Counted in a census in Dalum, Odense, Denmark

Add spaces: Whenthejetsdiffermuch,itprobablywillnotgoWhenfinishing±10fromtheoriginalisalreadylargevariationsareoftenmissingand2.5tonoticethedifference.

Answer:
When the jets differ much, it probably will not go When finishing ± 10 from the original is already large variations are often missing and 2.5 to notice the difference.