Use It was…that or What…is to focus attention on a particular element. Keep the structure clear and use it only when the emphasis helps your meaning.
Practical examples
It was the timing that caused the problem.
التوقيت هو الذي تسبب في المشكلة.
What we need is a clearer plan.
ما نحتاجه هو خطة أوضح.
It was Maya who identified the missing information.
مايا هي التي حددت المعلومات الناقصة.