Complex sentence: In the vexillum the cloth was draped from a horizontal crossbar suspended from the staff; this is unlike most modern flags in which the'hoist' of the cloth is attached directly to the vertical staff.
Split into simpler sentences: In the vexillum the cloth was draped from a horizontal crossbar suspended from the staff. That is unlike most modern flags in which the'hoist' of the cloth is attached directly to the vertical staff.