Complex sentence: Colonies were plated on kanamycin to select for resistant cells, and the colonies that underwent random transposition events were identified by "Bam" HI digestion and Southern blotting using an internal IS "1096" DNA probe.
Split into simpler sentences: Colonies were plated on kanamycin to select for resistant cells. Colonies that underwent random transposition events were identified by "Bam" HI digestion and Southern blotting using an internal IS "1096" DNA probe.