Complex sentence: Germantown High School, with its teams named the "Mavericks," maintains a total of 18 varsity sports, including boys and girls, including football, baseball, golf, soccer, track and field, cross-country, volleyball, swimming, and bowling.
Split into simpler sentences: Germantown High School, with its teams named the "Mavericks," maintains a total of 18 varsity sports. These include football, baseball, golf, soccer, track and field, cross-country, volleyball, swimming, and bowling.