Complex sentence: On 29th April, he began his study in Tsinghua School, but because of financial difficulties Tsinghua School (清华学堂) was suspended for a while, at that time, he went to Shanghai to do proofreading work for "People Daily" (民立日报).
Split into simpler sentences: On 29th April, he began his study in Tsinghua School, but because of financial difficulties Tsinghua School (清华学堂) was suspended for a while. At that time, he went to Shanghai to do proofreading work for "People Daily" (民立日报).