Could anyone help me with this text please?

Hi,

Could anybody help me to rewrite the following text in a proper format?

"32 male Wistar rats (weighing 220-300 gr.) were randomly divided into 4 groups of 8 and were kept in a chamber with the environmental conditions of 22 ± 2 ° C temperature, and 12: 12 light percentage one week before the test to adapt to the new environment, with free access to water and food."

Thanks!