Complex sentence: Since 1890 the glacier has advanced 7.5 kilometers and is 1.5 kilometers from Taku Point and if its current rate of advance continues (and interestingly enough, it is the only Juneau Icefield glacier that is advancing), this may be a possibility to happen again.
Split into simpler sentences: Since 1890 the glacier has advanced 7.5 kilometers and is 1.5 kilometers from Taku Point. If its current rate of advance continues (and interestingly enough, it is the only Juneau Icefield glacier that is advancing), this may be a possibility to happen again.