The verb form of the word 'Simplification' is -

Simplification (noun):
English Meaning - The process of making something less complicated and therefore easier to do or understand, or the thing that results from this process.
Bangla Meaning - সরলীকরণ।

• Simplification এর verb form হচ্ছে Simplify.

Simplify (verb):
English Meaning - To make something less complicated and therefore easier to do or understand.
Bangla Meaning - সরল করা; সহজসাধ্য বা সহজবোধ্য করা।

Other options,
Simply (adverb) - সাদামাটাভাবে।
Simple (adjective) - সাদামাটা।
Similar (adjective) - সমতুল্য।

Source:
1. Cambridge Dictionary.
2. Accessible Dictionary by Bangla Academy.