Complex sentence: Oxymatrine's regulation of plant growth has been tested with the Auxin Bio-test method, which showed it could increase the fresh and dry weight of a cucumber plant's cotyledon, promoting photosynthesis and enhancing the plant's growth below a temperature of 25 ℃.
Split into simpler sentences: Oxymatrine's regulation of plant growth has been tested with the Auxin Bio-test method. The test result show it could increase the fresh weight and dry weight of Cucumber's cotyledon, promoting the photosynthesis of cucumber, enhancing the plant's growth below a temperature of 25 ℃.