This principle is still in force, and most of the academic staff in the Prime Minister's Office are employed on fixed-term contracts for two-five years and are typically recruited from one of the other ministries.

Please remove spaces between words.
Thisprincipleisstillinforce,andmostoftheacademicstaffinthePrimeMinister'sOfficeareemployedonfixed-termcontractsfortwo-fiveyearsandaretypicallyrecruitedfromoneoftheotherministries.