Complex sentence: The satellite controllers within the same chassis connect to the BMC via the system interface called IPMB (Intelligent Platform Management Bus/Bridge)--an enhanced implementation of I²C (Inter-Integrated Circuit).
Split into simpler sentences: The satellite controllers within the same chassis are connected to the BMC via the system interface called IPMB (Intelligent Platform Management Bus/Bridge). IPMB is an enhanced implementation of I²C (Inter-Integrated Circuit).