Complex sentence: Falck purchased the security service division "ISS Securitas" from ISS in 1993, the first in a series of mergers, which later included both Group 4 Securicor and Wackenhut.
Split into simpler sentences: Falck purchased the security service division "ISS Securitas" from ISS in 1993. The first in a series of mergers, which later included both Group 4 Securicor and Wackenhut.