Simplify the following text for a Grade 11 native English-speaking person.
Original: They established the principles and basic techniques of partition chromatography , and their work encouraged the rapid development of several types of chromatography method : paper chromatography , gas chromatography , and what would become known as high performance liquid chromatography .
Simplified: High-performance liquid chromatography ( HPLC ) is also sometimes referred to as high-pressure liquid chromatography . It is column chromatography run under pressure to raise the speed of the process .