Complex sentence: The Russos also teased the inclusion of Doctor Strange and Captain Marvel in the films, though Feige indicated that Captain Marvel was slated to first appear in her own film, which is scheduled to be released in between both parts of "Infinity War".
Split into simpler sentences: The Russos also teased the inclusion of Doctor Strange and Captain Marvel in the films. Feige has indicated that Captain Marvel will first appear in her own film, which is scheduled to be released in between Parts 1 and 2 of "Infinity War".