You can split it to two 1x PCIe 2.0, or perhaps even 2x, 4x, probably even 3.0, 4.0, with the right chip, but in any case you need a PCIe switch, and they will

You can split it to two 1x PCIe 2.0, or perhaps even 2x, 4x, probably even 3.0, 4.0, with the right chip, but in any case you need a PCIe switch, and they will share the uplink bandwidth.