Complex sentence: When Dennis cannot afford cigarettes because of his drink, Ken gives him a pack, which Annie does not like and she tells Ken not to waste his sympathy on Dennis, as it is Elsie who they should feel sorry for.
Split into simpler sentences: When Dennis cannot afford cigarettes because of his drink, Ken gives him a pack. Annie disaproves of this, telling Ken not to waste his sympathy on Dennis, and that it is Elsie she feels sorry for.