Shorten this sentence by removing unnecessary words.
Rosalind Franklin was an English chemist, who made critical contributions to the understanding of DNA's structure.
Rosalind Franklin, an English chemist, contributed to understanding DNA's structure.
Complete the following task based on the instruction and optional input provided.### Instruction:
Shorten this sentence by removing unnecessary words.

### Input:
Rosalind Franklin was an English chemist, who made critical contributions to the understanding of DNA's structure.

### Output:
Rosalind Franklin, an English chemist, contributed to understanding DNA's structure.