Complex sentence: The Philippine bulbul was originally described in the genus "Turdus" and later placed in the genus "Ixos" re-classified to the genus "Hypsipetes" as it is very closely related to the type species, the black bulbul.
Split into simpler sentences: The Philippine bulbul was originally described in the genus "Turdus" and later placed in the genus "Ixos". It was re-classified to the genus "Hypsipetes" as it is very closely related to the type species of that genus, the black bulbul.