Complex sentence: As one might expect, attaching a square box to a round tube is more difficult, but there are advantages which offset this: there is greater space above the firebox for steam, and interior bracing of the firebox is far simpler.
Split into simpler sentences: As one might expect, attaching a square box to a round tube is more difficult, but there are advantages which offset this. There is greater space above the firebox for steam, and interior bracing of the firebox is far simpler.