Complex sentence: Although Sindhi was not a regional language in a well-defined area, there were persistent demands from the Sindhi-speaking people for the inclusion of Sindhi language in the Eighth Schedule of the Constitution.
Split into simpler sentences: Although Sindhi was not a regional language in a well-defined area. There were persistent demands from the Sindhi-speaking people for the inclusion of Sindhi language in the Eighth Schedule to the Constitution.