Add spaces: OnSaturdaywecanexpectmainlycloudlessweather.Morningtemperatureswillbearound1°C.Duringthedaytheywillreachamaximumof19°C.Lowtemperaturesatnightwillbearound3°C.Southerlywindsareweak.

Answer: On Saturday we can expect mainly cloudless weather. Morning temperatures will be around 1 °C. During the day they will reach a maximum of 19 °C. Low temperatures at night will be around 3°C. Southerly winds are weak.

Add spaces: Inputsofsixhazardoussubstancesintothenorth-eastAtlanticfellbetween1990and1998

Answer: Inputs of six hazardous substances into the north-east Atlantic fell between 1990 and 1998

Add spaces: HereareofferingsomeofthemostcharmingviewsoftheYaltaandthecoast-soitiswiththeupperroadinMassandra.

Answer:
Here are offering some of the most charming views of the Yalta and the coast - so it is with the upper road in Massandra.