Complex sentence: Because up to 17% of drywall is wasted during the manufacturing and installation processes and the drywall (USA) or plasterboard (UK and Ireland) material is frequently not re-used, disposal can become a problem.
Split into simpler sentences: Because up to 17% of gypsum products are wasted during the manufacturing and installation processes. Wallboard (Australia and others), plasterboard, Gyp (New Zealand), drywall (USA) or plasterboard (UK and Ireland) is frequently not re-used and disposal can become a problem.