Complex sentence: By tradition, the first slice of cake is given to the oldest Marine present, who in turn hands it off to the youngest Marine present, symbolizing the old and experienced Marines passing their knowledge to the new generation of Marines.
Split into simpler sentences: By tradition, the first slice of cake is given to the oldest Marine present, who in turn hands it off to the youngest Marine present. This symbolizes the old and experienced Marines passing their knowledge to the new generation of Marines.