shorter

"He measured his success relatively, that is, competitively."

"The student prepared for the test, but his notes were inadequately detailed, so he did poorly on the exam. "

"My grandmother taught me how to bake cookies when I was a child. "

"Seeing the rain clouds gathering, she started bringing the laundry inside, anticipating a sudden downpour. "

"The ladder leaned vertically against the wall. "

"My brother is comparatively quiet, while my sister is very outgoing. "

"The school principal is constituting a new student advisory board to improve communication. "

"Insufficient time is available to reflect on the problem"

"My grandfather helped me with my math homework. "

"The bookshelf was arranged horizontally, so the books lay flat instead of standing up. "

""Mr. Smith always uses the abbreviation 'etc.' instead of writing out 'et cetera'." "

"The student prepared insufficiently for the exam and, as a result, failed. "