TASK 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.
PROBLEM: As a philosopher , Ernst Haeckel wrote " Die Weltra thsel " ( 1895 1899 ; in English : " The Riddle of the Universe " , 1901 ) , the genesis for the term " world riddle " ( " Weltra tsel " ) ; and " Freedom in Science and Teaching " to support teaching evolution .

SOLUTION: As a philosopher , Ernst Haeckel wrote " Die Weltra tsel " ( 1895 1899 , " The Riddle of the Universe " , 1901 ) , and " Freedom in Science and Teaching " to support teaching evolution .

PROBLEM: Oxygen saturation ( symbol S ) is a relative measure of the concentration of oxygen that is dissolved or carried in a given medium as a proportion of the maximal concentration that can be dissolved in that medium .

SOLUTION: Oxygen saturation or dissolved oxygen ( DO ) is a relative measure of the amount of oxygen that is dissolved in a given medium .

PROBLEM: In odd years the awards are presented to American citizens or institutions by the Franklin and Eleanor Roosevelt Institute in New York City , though in the past the American awards were given in Hyde Park , New York .

SOLUTION:
In odd years the awards are given to Americans by the Franklin and Eleanor Roosevelt Institute in Hyde Park , New York .