Its complex because it has 2 clauses
The word 'that' is the demonstrative adjective.
Don't forget the most common demonstrative adjective used are This, That, These, Those.
Answer:
You cannot legally start exercising your certificate immediately because the bruise to the head may imply concussion or some part of the brain has been damaged.
As a pilot he has to rest for a few days so that the full extent of the injury to the head may be ascertained.
Explanation:
A head injury is any sort of injury to your brain, skull, or scalp. This can range from a mild bump or bruise to a traumatic brain injury. Common head injuries include concussions, skull fractures, and scalp wounds
No. I would not change my job for being precarious.