Complex sentence: While walking back to his TARDIS, he encounters the Twelfth Doctor, who is in a similar state of mind after his own ordeal with the Cybermen, before the pair find a confused and injured World War One British captain approaching them.
Split into simpler sentences: While walking back to his TARDIS he encounters the Twelfth Doctor, who is in a similar state of mind after his own ordeal with the Cybermen. The pair find a confused and injured World War One British captain approaching them.