Simplify the following text for a Grade 12 native English-speaking person.
Original: High-performance liquid chromatography ( HPLC ) is also sometimes referred to as high-pressure liquid chromatography .
Simplified: Liquid chromatography can be carried out either in a column or a plane . Present day liquid chromatography that generally utilizes very small packing particles and a relatively high pressure is referred to as high performance liquid chromatography ( HPLC ) .