Complex sentence: In every room, the students have shelves, beds, windows, cabinets and they can lend bedclothes from the warehouse of the dormitory, if they don't want to bring theirs into the dormitory.
Split into simpler sentences: In every room, the students have shelves, beds, windows, cabinets. Students can lend bedclothes from the warehouse of the dormitory if they don't want to bring theirs into the dormitory.