Construct a compound sentence by combining two given sentences.
Humans are social creatures. They need companionship.
Humans are social creatures and they need companionship.
Complete the following task based on the instruction and optional input provided.### Instruction:
Construct a compound sentence by combining two given sentences.

### Input:
Humans are social creatures. They need companionship.

### Output:
Humans are social creatures and they need companionship.