windows 10 18259+ insider narrator
in windows 10 18259+ you can read next, current and previous sentences in Narrator.
Read by sentence is available with the keyboard and with touch.
Prerequisite: Windows 10 build 18259 or higher installed on your PC.
Ctrl + Win + Enter - narrator enable/disable Ctrl + Win + N - narrator settings
Try reading by sentence in Microsoft Edge, Microsoft Notepad, Microsoft Word, WordPad
Caps + Ctrl + Period (.) to Read next sentence Caps + Ctrl + Comma (,) to Read current sentence Caps + Ctrl + M to Read previous sentence
Sentence is a new Narrator view and can be reached via Caps + Page Up or Caps + Page Down, and then you can navigate with Caps + Left arrow for move by previous sentence and Caps + Right arrow for move by next sentence.