Complex sentence: Since fall 2014, the slogan of Kellogg changed to "inspire growth," which encapsulates what Kellogg has accomplished over the past four years and provides a beacon for where the school is headed.
Split into simpler sentences: Since fall 2014, the slogan of Kellogg is changed to "Inspire growth". This theme encapsulates what Kellogg has accomplished over the past four years and provides a beacon for where the school is headed.