Add punctuation: The Greek drama continued
A: The Greek drama continued.

Add punctuation: Stability of institutions guaranteeing democracy the rule of law human rights and respect for and protection of minorities
A: Stability of institutions guaranteeing democracy, the rule of law, human rights and respect for and protection of minorities.

Add punctuation: After an impressive prize winning record Todd hoped for a Research Fellowship at Trinity but he failed in three attempts on one occasion losing out to Coxeter who won the Fellowship
A:
After an impressive prize winning record Todd hoped for a Research Fellowship at Trinity but he failed in three attempts, on one occasion losing out to Coxeter who won the Fellowship.