I2C multi sensors reading on Arduino
Should be easy enough.  Do you already know how to connect and communicate with one I2C device?  If so, connecting multiple should be simply a case of connecting them in parallel.

If you don't know how to communicate with a single I2C device, then...

For the Arduino software you can use Wire to talk to devices over I2C.

For the hardware, connect the I2C clock and data lines from the Arduino to the I2C devices.  More on that here.