Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
You are to separate a couple of children that really have fun together. When you separate them, they begin to cry and scream: WAAAAAAAAAHHHH (わ). Poor kids.
Let’s split this meat bun between two people.
It was a decision that spelt the difference between life and death.
If you split the pizza, could you give me the bigger half?