However, they are assumed to be insectivorous like other tree frogs that have been studied more intensively (Hicks 1999).
(they; are assumed; ) (they; to be; insectivorous like other tree frogs) (other tree frogs; have been studied more intensively; T:Hicks 1999)
they they other tree frogs
are assumed to be have been studied more intensively
insectivorous like other tree frogs
T:Hicks 1999