QUES: In this disease red blood cells fail to divide and become abnormally large

correct the punctuation.

CORRECTED: In this disease, red blood cells fail to divide and become abnormally large.

QUES: Use a subdomain from Indotophostcom

correct the punctuation.

CORRECTED: Use a subdomain from Indotophost.com

QUES: However the two new chairs designed by Jaime Hayon are the first step towards bringing that exceptional atmosphere into a setting

correct the punctuation.

CORRECTED:
However the two new chairs designed by Jaime Hayon are the first step towards bringing that exceptional atmosphere into a setting.