Complex sentence: When the Western Australia authorities would not heed his advice, he resigned in protest; the Australian timber industry pressured the national government to hire Lane Poole to survey the existing timber resources in Papua, then an Australian territory, and later in New Guinea.
Split into simpler sentences: When the Western Australia authorities would not heed his advice, he resigned in protest. The Australian timber industry pressured the national government to hire Lane Poole to survey the existing timber resources in Papua, then an Australian territory, and later in New Guinea.