Complex sentence: Beginning in 2011, polymer banknotes were introduced and have already been partially phased in, the 100's and 50's have already been issued and the 20's, 10's and 5's will be issued before the end of 2013.
Split into simpler sentences: Beginning in 2011, polymer banknotes were introduced and have already been partially phased in, the 100's and 50's have already been issued. The 20's, 10's and 5's will be issued before the end of 2013.