Definition: 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.

Positive Example 1 -
Input: In early work , Rutherford discovered the concept of radioactive half-life, the radioactive element radon, and classified three types of radiations: alpha, beta and gamma radiation .
Output: Rutherford discovered the radioactive half-life, the chemical element radon, and the three parts of radiation which he named Alpha, Beta, and Gamma .

Positive Example 2 -
Input: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Output: The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.

Negative Example 1 -
Input: Boryla was not in the 1952 playoffs.
Output: Boryla did not participate in the 1952 playoffs.

Negative Example 2 -
Input: The population in China increased to around 2,000 in 2005.
Output: By 2005, the population decreased to about 2,000.

Now complete the following example -
Input: In humans , the pigmentation of the iris varies from light brown to black , depending on the concentration of melanin in the iris pigment epithelium ( located on the back of the iris ) , the melanin content within the iris stroma ( located at the front of the iris ) , and the cellular density of the stroma .
Output: 


Output: In humans , the pigment of the iris varies from light brown to black .