Complex sentence: On November 1,2011 Apple updated GarageBand to 1.1, adding support for the iPhone and iPod touch among other features, including the ability to create custom chords for Smart Instruments, support for 3/4 and 6/8 time signatures, and exporting in AAC or AIFF format.
Split into simpler sentences: On November 1,2011 Apple introduced GarageBand for iOS 1.1, adding support for the iPhone and iPod touch, among other features. These included the ability to create custom chords for Smart Instruments, support for 3/4 and 6/8 time signatures, and exporting in AAC or AIFF format.