Complex sentence: In 1595 Tadaoki's life was in danger because of his friendship with Toyotomi Hidetsugu, and he told Gracia that if he should die she must kill herself, but when she wrote asking the priests about it, they informed her that suicide is a grave sin.
Split into simpler sentences: In 1595 Tadaoki's life was in danger because of his friendship with Toyotomi Hidetsugu, and he told Gracia that if he should die she must kill herself. When she wrote asking the priests about the plan, they informed her that suicide is a grave sin.