Complex sentence: A hyperlink has an "anchor", which is the location within a certain type of a document from which the hyperlink can be followed only from the homepage; the document containing a hyperlink is known as its source code document.
Split into simpler sentences: A hyperlink has an "anchor", which is the location within a certain type of a document from which the hyperlink can be followed only from the homepage. The document containing a hyperlink is known as its source code document.