Add spaces: Everyyearon1December,WorldAIDSDaybringstogetherpeoplefromaroundtheworldtoraiseawarenessaboutHIV/AIDSanddemonstrateinternationalsolidarityinthefaceofthepandemic.

Answer: Every year on 1 December, World AIDS Day brings together people from around the world to raise awareness about HIV/AIDS and demonstrate international solidarity in the face of the pandemic.

Add spaces: TherehemetUbIwerks,and,exceptforafewyearsinthelate1930s,thesetwocooperatinguntilDisney'sdeath.

Answer: There he met Ub Iwerks, and, except for a few years in the late 1930s, these two cooperating until Disney's death.

Add spaces: Thesetwosmallgroupsoftravellerswerethevanguardofpartiesoflightandofdarknesswhich,likeamanandhisshadow,havegoneeversincethroughthecenturies,andeverwestward.

Answer:
These two small groups of travellers were the vanguard of parties of light and of darkness which, like a man and his shadow, have gone ever since through the centuries, and ever westward.