Wǒ shízài fēnshēn-fáshù, méi bànfǎ tóngshí chǔlǐ liǎng jiàn shì.
I really can't be in two places at once - there's no way to handle both things simultaneously.
Tips
usage
The fixed phrase 分身乏术 (fēnshēn fá shù) - literally 'lacking the skill to split oneself' - is a common idiom meaning 'too tied up to do anything else', used when someone is overwhelmed and cannot take on more tasks.