Add spaces: DesignChristmastreemadeofwood,flatmodel.

Answer: Design Christmas tree made of wood, flat model.

Add spaces: AnaverageairtemperatureinJanuaryis7CandinJuly24.5C,withannualrainfallreaching840mm.

Answer: An average air temperature in January is 7 C and in July 24.5 C, with annual rainfall reaching 840 mm.

Add spaces: 9Davidlivedinthestronghold,andcalleditDavid'scity.DavidbuiltaroundfromMilloandinward.

Answer:
9 David lived in the stronghold, and called it David's city. David built around from Millo and inward.