Complex sentence: It had a special pattern that had been designed by Ruth Lane Poole in 1926 featuring the prime-ministerial monogram (consisting of the interwoven letters'P' and'M'), which also appears carved into the backs of the dining-room chairs.
Split into simpler sentences: It had a special pattern that had been designed by Ruth Lane Poole in 1926 featuring the Prime Ministerial Monogram. The Monogram (consisting of the interwoven letters'P' and'M'), also appears carved into the backs of the dining room chairs.