Complex sentence: Each band (or a desired band) is scrapped of the backing material, the backing material is then extracted with a suitable solvent (e.g. DCM) and filtered to give the isolated material upon removal of the solvent.
Split into simpler sentences: Each band (or a desired band) is scraped off the backing material. The backing material is then extracted with a suitable solvent (e.g. DCM) and filtered to give the isolated material upon removal of the solvent.