Complex sentence: Stanisław Szczęsny Potocki indulged in mysticism and came under the influence of Polish "Illuminati" and died in March 15,1805, without having time to say goodbye to her.
Split into simpler sentences: Stanisław Szczęsny Potocki indulged in mysticism, and came under the influence of Polish "Illuminati". He died in March 15,1805 died without having time to say goodbye to her.