In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

An organic light-emitting diode ( OLED or Organic LED ) , also known as an organic EL ( organic electroluminescent ) diode , is a light-emitting diode ( LED ) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current .
Organic light-emitting diode ( OLED ) is a type of light-emitting diode ( LED ) .

iPS cells closely resemble embryonic stem cells , the " in vitro " equivalent of the part of the blastocyst ( the embryo a few days after fertilization ) which grows to become the embryo proper .
iPS cells are like embryonic stem cells from a blastocyst ( the embryo a few days after fertilization ) .

Then , on April 26 , 1847 , twelve pastors representing fourteen German Lutheran congregations met in Chicago , Illinois , and officially founded the new church body , the " German Evangelical Lutheran Synod of Missouri , Ohio and Other States " .

On April 26 , 1847 , twelve pastors met in Chicago , Illinois , and officially started the " German Evangelical Lutheran Synod of Missouri , Ohio and Other States " .