Complex sentence: Arrigo, R. A. Marine microorganisms and global nutrient cycles "Nature" 2005; 437,349--355 The bacteria mediating this process were identified in 1999, and at the time were a great surprise for the scientific community.
Split into simpler sentences: Arrigo, R. A. Marine microorganisms and global nutrient cycles. Nature 437,349--355 (2005) The bacteria mediating this process were identified in 1999, and at the time were a great surprise for the scientific community.