Add spaces: Havanaismoreofapolycentriccity.

Answer: Havana is more of a polycentric city.

Add spaces: HelostoutmanytimesinelectionstotheAcademyofSciences,eventuallybeingelectedin1956whenhewas78yearsold.

Answer: He lost out many times in elections to the Academy of Sciences , eventually being elected in 1956 when he was 78 years old.

Add spaces: Thesubstanceformsacompoundwithoxygenmoleculesandfortifiestheoxidationofthecells.

Answer:
The substance forms a compound with oxygen molecules and fortifies the oxidation of the cells.