Complex sentence: He went to Catholic high school at Bishop DuBourg High School and attended the Missouri University of Science and Technology before subsequently transferring to New York University, where he first came up with the idea for Twitter.
Split into simpler sentences: He went to Catholic high school, at Bishop DuBourg High School. Dorsey attended the Missouri University of Science and Technology before subsequently transferring to New York University, where he first came up with the idea for Twitter.