Complex sentence: Ruppert's co-owner, Tillinghast L'Hommedieu Huston, who had been in Europe at the time that Ruppert had made the appointment, disliked Huggins and wanted to hire Wilbert Robinson, his drinking buddy.
Split into simpler sentences: Ruppert's co-owner, Tillinghast L'Hommedieu Huston, was in Europe at the time that Ruppert hired Huggins. Huston disliked Huggins, preferring to hire Wilbert Robinson, his drinking buddy.