Complex sentence: In May 2011, Zurich Instruments and Nanosurf have announced the start of a strategic technology partnership, in which the HF2LI 50 MHz PLL from Zurich Instruments is the official upgrade path for the easyPLL platform in Nanosurf's high-performance scanning probe microscopes.
Split into simpler sentences: In May 2011, Zurich Instruments and Nanosurf have announced the start of a strategic technology partnership. The HF2LI 50 MHz lock-in amplifiers from Zurich Instruments are going to replace the easyPLL platform in Nanosurf's high-performance scanning probe microscopes.