Translate the following English sentence to French:
"This is mainly because it is difficult to identify which department they need to address, but it is also because the staff in these departments have insufficient training to meet their demands."
Cela tient notamment au fait qu' il est difficile d' identifier les services auxquels ils doivent s' adresser mais aussi au fait que le personnel de ces administrations n' est pas suffisamment formé pour répondre à leurs demandes.