The term "experienced staff" refers to people who have a lot of knowledge, skills, and practice in a particular field or job. They have been doing the work for a while and have a good understanding of what they are doing. Full definition
Feel secure in knowing that your feline family member is in a warm (or cool in the summer), comfortable environment with experienced staff caring for them. (justcatsvet.com)
Able to accommodate small and large groups, the hotel has a professional, experienced staff at the ready to help you coordinate your event. (vacationidea.com)