Complex sentence: In 1950, Nelson Dayton passed away, and his son Donald Dayton assumed the role of president, and the Dayton Company was ran by him and four of his cousins instead of by a single person.
Split into simpler sentences: In 1950, Nelson Dayton passed away, and his son Donald Dayton assumed the role of president. The Dayton Company was ran by him and four of his cousins instead of by a single person.