Complex sentence: A P-N junction can convert absorbed light energy into a proportional electric current.Actually, the same process is reversed here (i.e. the P-N junction emits light when electrical energy is applied to it).
Split into simpler sentences: A P-N junction can convert absorbed light energy into a proportional electric current. The same process is reversed here (i.e. the P-N junction emits light when electrical energy is applied to it).