I am not sure if the bus that has been booked will be able to ______ all the students

"Since you have gone off the ________, the _________ sand is likely to damage the car."
The words that best fill the blanks in the above sentence are

"A common misconception among writers is that sentence structure mirrors thought; the more _________ the structure, the more complicated the ideas."

The word that best fills the blank in the above sentence is