Complex sentence: The TDT/TRSI (COOP) lasted for nearly a year, but in April of 1991 they abruptly parted ways and The Dream Team were back as a solitary group.
Split into simpler sentences: The TDT/TRSI (COOP) lasted for nearly a year. But in April of 1991 they abruptly parted ways and The Dream Team were back as a solitary group.