Add spaces: Wherenecessary,alsoprunetheshootsalittletopromotemorecompact,cushion-shapedgrowthoftheplant.

Answer: Where necessary, also prune the shoots a little to promote more compact, cushion-shaped growth of the plant.

Add spaces: HehadthemisfortunetolosebothhishandsinalaboratoryaccidentinNovember1907whentheywereburntoffinatransformerexplosion.

Answer: He had the misfortune to lose both his hands in a laboratory accident in November 1907 when they were burnt off in a transformer explosion.

Add spaces: PUKYCrusader20-3children'sbikeforboyssuitablefor:

Answer:
PUKY Crusader 20-3 children's bike for boys suitable for: