Complex sentence: By reducing the complexity of the organization to a single office and its holder, the need for by-laws is eliminated and the pastor of the church or overseer of the society is then not obliged to deal with a board of directors.
Split into simpler sentences: By reducing the complexity of the organization to one office and one office holder, the need for by-laws is eliminated. Also, the pastor of the church or overseer of the society does not have to deal with the complexity of a board of directors.