Early the next morning, the circus troupe left for the next town.
Literal
Next-morning early circus-troupe [topic-は] next [attributive-の] town [to-へ] departed.
サーカス団 ('circus troupe') — サーカス is a katakana loanword; 団 is the counter/suffix for groups/troupes. 翌朝 ('the next morning,' read よくあさ) is parallel to 翌日. Adverbial 早く ('early') modifies 出発した.