Delete the unnecessary phrase in this sentence.
He made sure that the document was accurate, and furthermore he checked it twice.
He made sure that the document was accurate and checked it twice.
Complete the following task based on the instruction and optional input provided.### Instruction:
Delete the unnecessary phrase in this sentence.

### Input:
He made sure that the document was accurate, and furthermore he checked it twice.

### Output:
He made sure that the document was accurate and checked it twice.