Complex sentence: Industrialisation or industrialization is the period of social and economic change that transforms a human group from an agrarian society into an industrial one, involving the extensive re-organisation of an economy for the purpose of manufacturing.
Split into simpler sentences: Industrialisation or industrialization is the period of social and economic change that transforms a human group from an agrarian society into an industrial one. It is the extensive organisation of an economy for the purpose of manufacturing.