Complex sentence: In February 2012, after contracting a respiratory illness, David was replaced by Glass Hammer vocalist Jon Davison who had been recommended to Squire by their common friend Taylor Hawkins, drummer for the Foo Fighters.
Split into simpler sentences: In February 2012, David was replaced by Glass Hammer singer Jon Davison after contracting a respiratory illness. Davison was recommended to Squire by their common friend Taylor Hawkins, drummer for the Foo Fighters.