b.: overwinter the tree in a bright location at a temperature of between 5 and 10c; ventilate the room frequently and provide shade if warm sunlight penetrates the room (from the end of january, especially for south-facing windows).

This is all lower case. Can you fix that?
B.: Overwinter the tree in a bright location at a temperature of between 5 and 10C; ventilate the room frequently and provide shade if warm sunlight penetrates the room (from the end of January, especially for south-facing windows).