Complex sentence: From 1934 to 1936 he was in the Palestine civil service, for some time being a personal secretary to High Commissioner Arthur Grenfell Wauchope, and where he started to become critical of British imperialism.
Split into simpler sentences: From 1934 to 1936 he was in the Palestine civil service, for some time being a personal secretary to High Commissioner Wauchope. There, he started to become critical of British imperialism.