Simplify the following text for a Grade 10 native English-speaking person.
Original: Kin selection has been discussed by Haldane and by Hamilton . â By kin selection I mean the evolution of characteristics which favor the survival of close relatives of the affected individual , by processes which do not require any discontinuities in the population breeding structure .
Simplified: Kin selection has been discussed by Haldane and by Hamilton ... By kin selection I mean the evolution of characteristics which favor the survival of close relatives of the affected individual .