Complex sentence: There he recommended curriculum changes to include, e.g., Vietnamese history and guerilla warfare (which met resistance from the American advisor); for a time he also ran afoul of the secretive Can Lao political party, a major support of the Diem regime.
Split into simpler sentences: There he recommended curriculum changes, e.g., inclusion of Vietnamese history and guerilla warfare, yet in this he met resistance from the American advisor. For a time he also ran afoul of the secretive Can Lao political party, a major support of the Diem regime.