Stocks attached to job offer

Following Series H, each [company name] share has a price of £xx.xxxx
You’ll be given a number of 'unapproved' options. We grant options once every 3 months, which will vest from your start date
These have a strike price (the price at which you can buy a [company name] share) of less than a penny
Our options vest over 4 years with a 1-year cliff
Every two years you'll be eligible to receive a ‘refresher’ options grant
If you change roles or get promoted, you may also receive additional options.

Can someone explain what this means ?

Thanks