Complex sentence: At a campaign assembly, candidates from the new political party addressed the student body in Spanish, a language of which use was prohibited at the time, prompting the cancellation of the assembly and the suspension of the offending students.
Split into simpler sentences: At a campaign assembly, candidates from the new political party addressed the student body in Spanish; addressing the student body in Spanish was prohibited at this time. This prompted the cancellation of the assembly and the suspension of the offending students.