Complex sentence: It has NFC and power connection to main smartphone, can have own RAM, CPU, software or hardware, can influence smartphone performance as easy replaceable accessory or extension, e.g. change appearance and ambience settings, or connect the hardware keyboard.
Split into simpler sentences: It has NFC and power connection to main smartphone, can have own RAM, CPU, software or hardware, can influence on smartphone performance as easy replaceable accessory or extension. E.g. used to change appearance and ambience settings, or connect the hardware keyboard.