Complex sentence: Eddy is considered to be one of America's most authoritative terrorism and national security experts as well as an expert on international affairs, transnational issues, and corporate risk, and has advised leading corporations and the US and foreign governments.
Split into simpler sentences: Eddy is considered to be one of America's most authoritative terrorism and national security experts as well as an expert on international affairs, transnational issues, and corporate risk. Eddy has advised leading corporations and the US and foreign governments.