Add spaces: darkdaysfollowingdiagnosis.

Answer: dark days following diagnosis.

Add spaces: Theteetharegroundonthreesidestomakethemextremelysharp,effectiveandgentleonthetrees.

Answer: The teeth are ground on three sides to make them extremely sharp, effective and gentle on the trees.

Add spaces: Sizeapprox185cmhighand100cmwide.

Answer:
Size approx 185 cm high and 100 cm wide.