Complex sentence: Juniors can run for Student Council president at the end of their Junior year; and Seniors can create a "Senior Project", a self-designed path of study replacing several courses he would otherwise be taking in the second semester.
Split into simpler sentences: Juniors can run for Student Council president at the end of their junior year. Any Senior can create a "Senior Project", a self-designed path of study replacing several courses he would otherwise be taking in the second semester.