Sentence Separator, accessible at http://jackdalton.org/, is a tool designed to help users distinguish and separate sentences within a block of text. It focuses on improving readability and text analysis by clearly identifying sentence boundaries. The tool is particularly useful for professionals dealing with large amounts of written content, such as editors and writers, allowing for easy parsing and modification of text. Developed by Jack Dalton, the tool emphasizes simplicity and efficiency in processing textual information.