Complex sentence: On December 11,2011, Mauer announced his engagement to Maddie Bisanz, his girlfriend of about 18 months and a fellow graduate of Cretin-Derham Hall High School.
Split into simpler sentences: On December 11,2011, Mauer announced his engagement to Maddie Bisanz, his girlfriend of about 18 months. Like Mauer, Bisanz is also a graduate of Cretin-Derham Hall High School.