Complex sentence: Historically, computers and portable audio players had memory restrictions, the first portable players using internal memory (ram/hard drive) started at 32 megabytes, MP3 was adopted as a standard to heavily compress the files and take down the size of a song.
Split into simpler sentences: Historically, computers and portable audio players had memory restrictions: the first portable players utilizing internal memory (ram/hard drive) started out with just 32 megabytes. The mp3 format was adopted as a standard to heavily compress the files and take down the size of a song.