Complex sentence: The United States is converting its over-the-air television broadcasts to digital "ATSC" in June 2009, however this will have very limited impact in ending the need for DVD recorders to perform realtime MPEG-2 encoding or transcoding.
Split into simpler sentences: The United States converted its over-the-air television broadcasts to digital "ATSC" in June 2009. However this will have very limited impact in ending the need for DVD recorders to perform realtime MPEG-2 encoding or transcoding.