Complex sentence: Aramids are generally prepared by the reaction between an amine group and a carboxylic acid halide group (aramid); commonly this occurs when an aromatic polyamide is spun from a liquid concentration of sulphuric acid into a crystallized fibre.
Split into simpler sentences: Aramids are generally prepared by the reaction between an amine group and a carboxylic acid halide group (aramid);. Commonly, this occurs when an aromatic polyamide is spun from a liquid concentration of sulphuric acid into a crystallized fibre.