Original: He introduced measures to combat resistance and when a widespread strike took place in Amsterdam, Arnhem and Hilversum in May 1943 special summary court-martial procedures were brought in and a collective fine of 18 million guilders was imposed.
Simplified: He introduced measures to combat 'terror' and when a widespread strike took place in Amsterdam, Arnhem and Hilversum in May 1943 special summary court-martial were used and a collective fine of 18 million guilders was imposed.