Answer
1) My mother was annoyed I arrived late.
2) Mark is a vicious gossiper.
3) As Maria wrote the conclusion, the secretary finished typing.
4) We should inform our employees of the new policy quickly.
Step-by-step explanation:
I just made the sentences more straight-to-the-point and took away words that were adding no meaning such as "because of the fact that" and "during the time in which".