Complex sentence: The Keller school district serves students from Kindergarten-6 and gives students the option of attending junior and senior high school at relatively nearby Wilbur High School, Lake Roosevelt High School or Republic High School.
Split into simpler sentences: The Keller school district serves students from Kindergarten-6. It gives students the option of attending junior and senior high school at relatively nearby Wilbur High School, Lake Roosevelt High School or Republic High School.