Complex sentence: While fleeing from the orphans, Miss Hannigan and Rooster are intercepted upon the arrival of President Franklin D. Roosevelt arrives with his Secret Service as the President reads the papers that identity Miss Hannigan, Rooster, and Lily while also mentioning the aliases of the latter two.
Split into simpler sentences: While fleeing from the orphans, Miss Hannigan and Rooster are intercepted upon the arrival of President Franklin D. Roosevelt along with his Secret Service. The President reads the papers that identity Miss Hannigan, Rooster, and Lily while also mentioning the aliases of the latter two.