Complex sentence: Both Governor Coehlo, and the Mayor of Manaus, Gilberto Mestrinho, later to succeed Coelho as Governor, co-sponsored the expedition, which was planned to last approximately one to two years.
Split into simpler sentences: Both Governor Coehlo, and the Mayor of Manaus, Gilberto Mestrinho, later to succeed Coelho as Governor, co-sponsored the expedition. The assignment was planned to last approximately one to two years.