。
I'm tired of listening to you complain.
Literal
I [topic-は] already you [subject-が] complaints [object-を] spill [nominalizer-の] [object-を] listen-tired-of.
ぐちをこぼす ('to grumble, complain') — ぐち ('complaints') + こぼす ('to spill'). 聞き飽きる ('to be tired of listening') — a compound verb from 聞く ('listen') + 飽きる ('tire of'). もう ('already') emphasizes that patience has run out. ~ている marks the ongoing state.