Complex sentence: Matrix molding or Matrix transfer molding is a technique used during molding in which rigid outer shell is first created and then there isan introduction of a softer molding material between the shell and the prototype.
Split into simpler sentences: Matrix molding or matrix transfer molding is a technique used during molding. The person doing the assembly will first create the rigid outer shell and then her or she will an introduce the softer and more fluid molding material between the shell and the prototype.