Complex sentence: According to some accounts, Ty Cobb, who was himself barnstorming in Japan, saw Oana playing, suggested he play professionally in the United States, and recommended Oana to the San Francisco Seals of the Pacific Coast League.
Split into simpler sentences: According to some accounts, Ty Cobb, who was himself barnstorming in Japan, saw Oana playing, suggested he play professionally in the United States, and recommended Oana to the San Francisco Seals. Oana began his professional baseball career with the San Francisco Seals of the Pacific Coast League.