Complex sentence: The most well-known appearance of Tentomon is in the Digimon Adventure anime as the partner of Izzy Izumi, who also appears in the sequel series Digimon Adventure 02 and all the Digimon Adventure/02 related movies.
Split into simpler sentences: The most well-known appearance of Tentomon is in the Digimon Adventure anime as the partner of Izzy Izumi. The Tentomon of Digimon Adventure also appears in the sequel series Digimon Adventure 02 and all the Digimon Adventure/02 related movies.