Complex sentence: Air Scouts are members of the international Scouting movement, of their respective Scouting organisations as a branch, similar to Sea Scout branches, with a particular emphasis on an aviation themed programme and/or flying-based activities.
Split into simpler sentences: Air Scouts are members of the international Scouting movement of their respective Scouting organizations as a branch similar to Sea Scout branches. It has a particular emphasis on an aviation themed programme and/or flying-based activities.