Is it possible to simplify the reservation form?

Yes. You can make it so that a customer doesn't have to select price options and fields. Also, you can show the resource's calendar immediately after the widget is loaded.
Open the resource settings and set the the checkbox Skip reservation step. For correct work the resource must have only one price option.
As a result, the price option will be selected automatically showing the order cart to the customer.
To open the resource's calendar immediately, go to the widget settings and select the display mode called Calendar.
See the example in action:
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