Simplify the following text for a Grade 5 native English-speaking person.
Original: Takahashi managed to work on Maison Ikkoku on and off simultaneously with Urusei Yatsura . She concluded both series in 1987 , with Urusei Yatsura ending at 34 volumes , and Maison Ikkoku being 15 .
Simplified: She finished both Urusei Yatsura ( 34 books ) with Maison Ikkoku ( 15 books ) .