When there is a double consonant in a word, you typically syllabicate it between the double consonants. For example, in the word "butter," you would syllabicate it as "but-ter."
but ter
ren.dez.vous
The word "item" is syllabicated as i-tem.
preach-ed.
Fin-e
am-nes-ty
Un-sure.
Mis-spell.
Grum-ble
an-i-mal
The word, history, is syllabicated HIS-TOR-Y