Complex sentence: Much of his early boxing experience took place as a club fighter in Manhattan where his family maintained a residence until at least 1910, his father having an apartment there in May of 1913 on 167 East Broadway, when Abe won the Panamanian Heavyweight title.
Split into simpler sentences: Much of his early boxing experience took place as a club fighter in Manhattan where his family maintained a residence until at least 1910. Abe's father still maintained an apartment there in May of 1913 on 167 East Broadway, when Abe won the Panamanian Heavyweight title.