Complex sentence: Contractual rights and duties are generally transmissible on death, although not in the case of a "delectus personae" or an express or tacit agreement to the contrary, in which case resolution of the contract is left to the executor of the deceased's estate.
Split into simpler sentences: Contractual rights and duties are generally transmissible on death, although not in the case of a "delectus personae" or an express or tacit agreement to the contrary. The resolution of the contract is left to the executor of the deceased's estate.