Breakdown of satooya ni naru.

Questions & Answers about satooya ni naru.
It is read さとおやになる.
- 里親 = さとおや
- に = に
- なる = なる
So the whole sentence is さとおやになる.
The spaces are just there to help learners see the parts more clearly.
In normal Japanese writing, this would usually be written as:
里親になる。
Japanese normally does not put spaces between words the way English does.