Complex sentence: Adjacent to the dining room is a pantry and storage room that leads to an open passageway to the kitchen that is separate from the house to prevent risk of fire as well as to eliminate noise, heat and odors of cooking.
Split into simpler sentences: Adjacent to the dining room is a pantry and storage room that leads to an open passageway to the kitchen. This was built separate from the house to prevent risk of fire to the main house, as well as to exclude the noise, heat and odors of cooking.