Complex sentence: The next morning Nick Fury, S.H.I.E.L.D. 's director, approaches Stark, revealing Rushman as undercover agent Natasha Romanoff and that Howard Stark was a S.H.I.E.L.D. founder whom Fury knew personally, Natalia then gives Stark an injection that temporarily abates the symptoms of the palladium poisoning.
Split into simpler sentences: The next morning Nick Fury, S.H.I.E.L.D. 's director, approaches Stark, revealing Rushman as undercover agent Natasha Romanoff and that Howard Stark was a S.H.I.E.L.D. founder whom Fury knew personally. Natasha then gives Stark an injection that temporarily abates the symptoms of the palladium poisoning.