Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 9
Distraction; Confusion; Situational Awareness; Time Pressure
ATC Issue All Types; Airspace Violation All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Airspace Structure; Human Factors; Procedure
I was working two sectors combined during a west flow. We were ILS XXR and visuals to Runway XY. I was trying to lay off of Runway XY because I just didn't have time to vector and hit the ghosts. I am already busy vectoring for space to [Runway] XXR and I had a couple that I was taking to Runway XY. Aircraft X popped up from ZZZ and I just didn't have a good way to take them to Runway XXR. I decided to assign them Runway XY. All my arrivals to XXR are already descended to 6;000 feet. Aircraft X came to me at 6;000 feet and I needed to get them under my ZZZ1 arrivals. I then descended Aircraft X to 5;000 feet and didn't see the traffic in front of them who ZZZ1 was working. By the the time I noticed it Aircraft X was already responding to an RA. After coming off of a COVID-19 reduced staffing schedule a lot of A siders are a little rusty in the radar room. I think that sectors should have been split.
TRACON Controller working busy combined arrival sectors descended an aircraft from 6;000 feet to 5;000 feet which caused a conflict with another aircraft.