Complex sentence: Miss Castries' father, Honorary Lieutenant Castries, calls and threatens Peythroppe with a lawsuit for breach of promise, but his daughter knows how a lady should behave and keeps her broken heart to herself.
Split into simpler sentences: Miss Castries' father, Honorary Lieutenant Castries, calls, and threatens Peythroppe with a lawsuit for breach of promise. But his daughter knows how a lady should behave, and keeps her broken heart to herself.