Complex sentence: Cathepsin activates trypsinogen to trypsin leading to further activation of other molecules of trypsinogen and immediate pancreatic cell death according to either the necrosis or apoptosis mechanism (or a mix between the two).
Split into simpler sentences: Cathepsin activates trypsinogen to trypsin leading to further activation of other molecules of trypsinogen and immediate pancreatic cell death. The response to this cell death can proceed according to either the necrosis or apoptosis mechanism (or a mix between the two).