总的来说很不错哦,基本没有语法和拼写错误.帮你改了几处小错和一些比较生硬的地方,这样听起来更地道一点.改好如下：
"Hello,everyone,today our group will introduce some information on insurance.We hope that by our efforts,you can know more about insurance.Firstly,let me introduce the types of insurance.
Types of insurance
As is known to all,.insurance is an arrangement.The insurer promises to pay the policy holder a sum of money if any event causes the policyholder to suffer a financial loss.And the various insurances can be divided into four types:they are Life insurance¬¬,Non-insurance,Reinsurance and goverment sponsored insurance."