Complex sentence: Preparations of beta-Glucuronidase from the snail Helix pomatia, historically referred to by the trademark "Glusulase", are used to digest the ascus of the yeast "Saccharomyces cerevisiae" after sporulation.
Split into simpler sentences: Preparations of beta-glucuronidase from the snail Helix pomatia are commercially available and referred to by the trademark "Glusulase". These enzymes preparations are used to digest the ascus of the yeast "Saccharomyces cerevisiae" after sporulation.