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: Belarus declared itself sovereign on 27 July 1990 by issuing the Declaration of State Sovereignty of the Belarusian Soviet Socialist Republic .

SOLUTION: Belarus said it was free on 27 July 1990 .

PROBLEM: 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 .

SOLUTION: iPS cells are like embryonic stem cells from a blastocyst ( the embryo a few days after fertilization ) .

PROBLEM: In classical antiquity , Illyria ( ; , " Illyri ́ a " or , " Illyri ́ s " ; , see also : " Illyricum " ) was a region in the western part of the Balkan Peninsula inhabited by numerous tribes of people collectively known as the Illyrians .

SOLUTION:
Illyria was an ancient region in the western part of today 's Balkan Peninsula .