OK, here’s how to “fish” the answer on this one.
An I socket is for… I2C. https://www.ghielectronics.com/docs/120/gadgeteer-sockets
I2C is a bus. It relies on having devices connected to the bus with different I2C addresses. This means you can safely connect two devices at the same time, it’s only a matter of electrically connecting them…
From the above socket description, you can see that as a mandatory part of an I socket is two GPIOs (pin 3, interrupt capable, and pin 6) and then SDA and SCL (pin 8 & 9) which are the I2C bus connections. But that doesn’t mean your two devices use the other pins - if they do need either or both, you have to find an unused interrupt capable pin and a GPIO and connect appropriately (you may need to look at the data sheet and potentially the driver for the devices to understand if they’re used for things like a “data ready” interrupt line).
Then you need to consult the cerbuino bee circuit diagram and identify the I socket SDA and SCL pins are the same as the SDA and SCL pins on the Arduino headers and then connect them up to your extender/breakout module, and then connect your second device.