Heard that (hearsay)
This is used to report information based on hearsay.
Examples
彼は新しいレストランを始めるそうです。
I heard that he is starting a new restaurant.
新しいメニューが人気だそうです。
I heard that the new menu is popular.
料理長が変わったそうです。
I heard that the head chef has changed.
Quick check
I heard that the head chef has changed. 料理長が変わった___。