パイを食べるとパイ生地がポロポロ落ちるって英語でなんて言うの？

"パイを食べるとパイ生地がポロポロ落ちる"
- When you eat a pie, the crust crumbles and falls.

ポロポロ落ちて周りが汚くなるので、パイは食べるのが難しいです...。
- Eating pies are difficult because the crust crumbles and falls and gets the place dirty.
- The pie crust gets all over the place so it is difficult to eat pie.