I want to make sure the motherboard is compatible with the case and PSU before buying. I think the motherboard only has one 3-pin case fan connector? so will the Fan Power splitter cable work on the case and motherboard?
Yes it is compatible, it supports microatx motherboards.
The PSU has a split 4+4 EPS connector so one of them goes to the mobo, so that works fine.
The splitter generally should work, but i'm not sure if both case fans come with the 3 pin connector from the pictures.
But if they do it should work. And if not you can plug them in directory to the PSU 12V molex connectors.