Complex sentence: Guilloché (or guilloche) is a decorative technique in which a very precise, intricate and repetitive pattern is mechanically engraved into an underlying material via engine turning, which uses a machine of the same name, also called a rose engine lathe.
Split into simpler sentences: Guilloché (or guilloche) is a decorative engraving technique in which a very precise intricate repetitive pattern or design is mechanically engraved into an underlying material. Specifically, it involves a technique of engine turning, using a machine of the same name, also called a rose engine lathe.