Complex sentence: At age 13, Fossett earned the Boy Scouts'highest rank of Eagle Scout and was a Vigil Honor member of the Order of the Arrow, the Boy Scouts' honor society, where he served as lodge chief.
Split into simpler sentences: At age 13, Fossett earned the Boy Scouts'highest rank of Eagle Scout. He was a Vigil Honor member of the Order of the Arrow, the Boy Scouts' honor society, where he served as lodge chief.