Complex sentence: The period during which the most stations were renamed was undoubtedly the post-World War II period-for example, Marboeuf at the center of the Champs-Élysées was renamed Franklin D. Roosevelt in 1946 and Aubervilliers-Villette was renamed Stalingrad the same year.
Split into simpler sentences: The period during which the most stations were renamed was undoubtedly the post-World War II period. To name a few, Marboeuf at the center of the Champs-Élysées was renamed Franklin D. Roosevelt in 1946 and Aubervilliers-Villette was renamed Stalingrad the same year.