How do I split color-coded cells??

We use an Excel spreadsheet for our room bookings and color code based on which class is using the room. Sometimes when one class uses a room in the morning and another in the afternoon, we need to split the cell. I did not create this document, but I'm trying to make a few cells look like rows 32 and 33 (see screenshot in comments). When I copy and paste into another cell, it takes up two spots. I've watched countless YouTube videos, followed tutorials, and I can't seem to solve this issue. I feel like I'm going crazy!