Read the sentence.

After spending years of time conducting research to look for information, the scientist finally made a discovery that would solve a problem once and for all.

Which revision most effectively shortens the sentence to make it less repetitive and more precise?

1. The scientist conducted research to find information and discovered a solution to a problem he wanted to solve

2. The scientist spent a long time looking for research information and made an important discovery.

3. After years of research, the scientist discovered a cure for the rare disease.

This is sadly the end of my 3 question streak. D: