Complex sentence: ECFR's national offices hold regular events, including seminars, ginger groups and publication launches, including ECFR London's invitation-only "Black Coffee Mornings," at which guest speakers have included Louise Arbour, Joseph Nye and George Robertson.
Split into simpler sentences: ECFR's national offices hold regular events such as seminars, ginger groups and publication launches. Guest speakers at ECFR London's invitation-only "Black Coffee Mornings" have included Louise Arbour, Joseph Nye and George Robertson.