Complex sentence: In 1980, the school's name was yet again changed to assume its current name-this was circa Feb/Mar 1980, shortly before the commencement of the inaugural Form Six (two Lower Six Arts classes).
Split into simpler sentences: In 1980, the school's name was yet again changed to assume its current name. The last name change occurred in Feb/Mar 1980, shortly before the commencement of the inaugural Form Six (two Lower Six Arts classes).