Connect Led fixture 2 wires, to ceiling light with 4 wires.

[Roxy brown]

I have 2 lights connected to 1 switch. I installed a led light fixture on one light, it had one red wire and one black wires. It was easy to match the wires to the led light fixture. The 2nd light has 2 red and 2 black. Because the 2 lights are wired together. How do I put a led light fixture on this light? How do I wire the fixture to the 4 wires on the 2nd light. The led fixture only has 2 wires. 1 red. 1 black