convert to IOB and split sentences

Hello @ines ,
I am trying to use spacy convert command to IOB format. Is there anyway to split the sentence for 400 tokens?. Basically i would like to split document containing 2800 tokens into smaller sentences.

If i did manually split after doing biluo_tags_from_offsets, its breaking labels like I-tag might be the start of the next sentence and B-tag is the last in the sentence which is followed by I-tag.