Complex sentence: Varak is made by pounding silver into a sheet a few micrometres (µ) thick (0.2 micron to 0.8 micron), and backed with paper for support; this paper is peeled away before use.
Split into simpler sentences: Varak is made by pounding silver into a sheets, few micrometres (µ) thick, typically 0.2 micron to 0.8 microns. The sheets are typically backed with paper for support; this paper is peeled away before use.