Complex sentence: In a normal plasmid DNA preparation, multiple forms of DNA may be present, and gel from the electrophoresis of the plasmids would normally show a main band which would be the negatively supercoiled form, while other forms of DNA may appear as minor fainter bands.
Split into simpler sentences: In a normal plasmid DNA preparation, multiple forms of DNA may be present. The gel from the electrophoresis of the plasmids would normally show a main band which would be the negatively supercoiled form, while other forms of DNA may also appear as minor fainter bands.