Complex sentence: After two months, Hajduk lost many points under Ivic and the management sacked Ivic and asked Bonačić to return, which he did, but due to the points lost under Ivic, Bonačić could only manage a respectable second behind Dinamo Zagreb.
Split into simpler sentences: After two months, Hajduk had lost many points under Ivić and the management sacked him and asked Bonačić to return. Bonačić returned, but due to the points lost under Ivić, he could only manage a respectable second behind Dinamo Zagreb.