Complex sentence: MPEG-4 Part 2 is a video compression technology developed by MPEG, and now many documents simply refer this as MPEG-4 video, because MPEG-4 part 10 is also called H.264 (jointly developed by ITU-T and MPEG).
Split into simpler sentences: MPEG-4 Part 2 is a video compression technology developed by MPEG, and now many documents simply refer this as MPEG-4 video. The other common video codec defined as part of the MPEG-4 Standard, MPEG-4 part 10 is commonly refered to as H.264 (jointly developed by ITU-T and MPEG).