Task: Text Simplification
Input (English): he was involved in litigation in 1889 with his former assistant charles a. borst , and the " great star-catalog case " peters v. borst went before the supreme court of new york.
Output (English): he participated in a lawsuit in 1889 with his prior assistant charles a. borst , and the " great stat-catalog case " peters v. borst before the supreme court of new york.