Original sentence: The stimulus for such a differentiation was an increased reliance on more sophisticated types of agriculture in the forest steppe, whilst more northerly communities used primarily stock-rearing with added swidden ("slash-and-burn") agriculture, as well as the inclusion of forest-steppe communities into the "Scythian network".This marked the evolution of proto-Slavic stock
Edited sentence: The stimulus for such a differentiation was an increased reliance on more sophisticated types of agriculture in the forest steppe, whilst more northerly communities used primarily stock-rearing with added swidden ("slash-and-burn") agriculture.With the inclusion of forest-steppe communities into the "Scythian network", the evolution of proto-Slavic stock began