terwijl means “while”. Starts a sub-clause and sends its verb to the very end.
Subordinating · Onderschikkend
Zij leest terwijl hij kookt.
She reads while he cooks.
Terwijl ik werkte, sliep de baby.
While I worked, the baby slept.
Drag scrambled words into the right Dutch order and master inversion and the verb-final rule.