Complex sentence: Farncomb successfully defused the situation by making the offer that any sailor wanting to wear blue uniform all day ashore could do so after asking permission; an offer taken up by almost every sailor taking shore leave.
Split into simpler sentences: Farncomb successfully defused the situation by making the offer that any sailor wanting to wear blue uniform all day ashore could do so after asking permission. This offer was taken up by almost every sailor taking shore leave.